0001437749-22-003779 | 10-K | XBRL Viewer

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

Note 1 — Nature of Business

Organization and business

Proto Labs, Inc. and its subsidiaries (Proto Labs, the Company, we, us, or our) is a digital manufacturer of custom prototypes and on-demand production parts. The Company utilizes injection molding, computer numerical control (CNC) machining, 3D printing and sheet metal fabrication to manufacture custom parts for its customers. The Company's customers conduct nearly all of their business over the internet. The Company targets its products to the millions of product developers and engineers who use three-dimensional computer-aided design (3D CAD) software to design products across a diverse range of end-markets. In addition, the Company serves procurement and supply chain professionals seeking to manufacture custom parts on-demand. The Company has established operations in the United States, Europe and Japan, which the Company believes are among the largest geographic markets where these product developers and engineers are located. Through the acquisition of Hubs in 2021, the Company is able to provide its customers access to a global network of premium manufacturing partners who reside across North America, Europe and Asia, complementing its in-house manufacturing. Proto Labs, Inc. is headquartered in Maple Plain, Minnesota. The Company’s subsidiaries are:

Name	Location

PL-US International LLC	United States
Hubs Manufacturing Inc.		United States
3D Hubs Manufacturing LLC		United States
Proto Labs Ltd.	United Kingdom
PL International Holdings, UK, Ltd.	United Kingdom
PL Euro Services Limited	United Kingdom
Proto Labs GmbH	Germany
Proto Labs Tooling GmbH	Germany
3D Hubs B.V.		Netherlands
Proto Labs, G.K.	Japan

Note 2 - Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2021

Significant Accounting Policies [Text Block]

Note 2 — Summary of Significant Accounting Policies

Principles of consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, as listed within “Organization and business” above. All intercompany accounts and transactions have been eliminated in consolidation.

Comprehensive income

Components of comprehensive income include net income, foreign currency translation adjustments and net unrealized gains and losses on investments in securities. Comprehensive income is disclosed in the accompanying Consolidated Statements of Comprehensive Income and Consolidated Statements of Shareholders’ Equity.

Accounting estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and related disclosures at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash and cash equivalents

Cash and cash equivalents include cash and other investments, including marketable securities, with maturities of three months or less at the date of purchase. The Company maintains its cash in bank deposit accounts, which, at times, may exceed federally insured limits. The Company has not experienced any losses on such accounts.

Marketable securities

As of December 31, 2021, marketable securities are categorized as available-for-sale and are recorded at fair value. In the first quarter of 2021, the Company sold held-to-maturity securities in order to partially fund the acquisition of Hubs. As a result of the sale, all remaining marketable securities were reclassified to available-for-sale securities and reported at fair value. Management determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. The classification of marketable securities as current or non-current is dependent upon the security’s maturity date. Securities with maturities of three months or less at the time of purchase are categorized as cash equivalents as described above.

As of December 31, 2020, marketable securities included held-to-maturity debt securities recorded at amortized cost. Debt securities were classified as held-to-maturity when the Company had the positive intent and ability to hold the securities to maturity. Held-to-maturity securities were stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity computed under the effective interest method. Such amortization was included in other income, net. Interest on securities classified as held to maturity was included in other income, net. During the first quarter of 2020, the Company adopted the FASB ASU 2016-13, Financial Instruments – Credit Losses. The Company calculated the expected credit loss for each security in its portfolio using the probability-of-default method. The Company concluded the adoption of the guidance had no material impact on its consolidated financial statements.

Accounts receivable and allowance for doubtful accounts

Accounts receivable are reported at the invoiced amount less an allowance for doubtful accounts. As of each balance sheet date, the Company evaluates its accounts receivable and establishes an allowance for doubtful accounts based on a combination of specific customer circumstances and credit conditions taking into account the history of write-offs and collections. A receivable is considered past due if payment has not been received within the period agreed upon in the invoice. Accounts receivable are written off after all collection efforts have been exhausted. Recoveries of trade receivables previously written off are recorded when received.

Inventory

Inventory consists primarily of raw materials, which are recorded at the lower of cost or market, using the standard cost method, which approximates first-in, first-out (FIFO) cost. The Company periodically reviews its inventory for slow-moving, damaged and discontinued items and provides allowances to reduce such items identified to their recoverable amounts.

Property, equipment and leasehold improvements

Property, equipment and leasehold improvements are stated at cost. Major improvements that substantially extend an asset’s useful life are capitalized. Repairs, maintenance and minor improvements are charged to operations as incurred. Depreciation, including amortization of leasehold improvements and assets recorded under capital leases, is calculated using the straight-line method over the estimated useful lives of the individual assets and ranges from 3 to 39 years. Manufacturing equipment is depreciated over 3 to 15 years, office furniture and equipment are depreciated over 3 to 7 years, computer hardware and software are depreciated over 3 to 5 years, building costs are depreciated over 39 years, leasehold improvements are depreciated over the estimated lives of the related assets or the life of the lease, whichever is shorter, and building and land improvements are depreciated over 10 to 39 years. Assets not in service are not depreciated until the asset is put into use.

The Company follows ASC 350-40, Internal-Use Software, in accounting for internally developed software. As of December 31, 2021 and 2020, $49.4 million of software development costs were capitalized.

Goodwill

The Company recognizes goodwill in accordance with ASC 350, Intangibles—Goodwill and Other. Goodwill is the excess of cost of an acquired entity over the amounts assigned to assets acquired and liabilities assumed in a business combination. Goodwill is allocated to the Company's reporting units, which are determined by the discrete financial information available for the component and whether it is regularly reviewed by segment management. The Company's reporting units are the United States, Europe and Japan. Goodwill is not amortized.

Goodwill is tested for impairment annually at the beginning of the fourth quarter, and is tested for impairment between annual tests if an event occurs or circumstances change that would indicate the carrying amount may be impaired. An impairment charge for goodwill is recognized only when the estimated fair value of a reporting unit, including goodwill, is less than its carrying amount. In 2021, the Company performed a quantitative analysis based on the performance of Europe in 2021 and the amount of goodwill recorded during the year from the Hubs acquisition. The quantitative impairment test requires judgment, including the identification of reporting units, the assignment of assets, liabilities and goodwill to reporting units, and the determination of fair value of each reporting unit. The impairment test requires the comparison of the fair value of each reporting unit with its carrying amount, including goodwill. In performing the impairment test, the Company determined the fair value of its reporting units through a combination of the income approach by using discounted cash flow (DCF) analyses and the market approach through the guideline company method. Determining fair value requires the Company to make judgments about appropriate discount rates, perpetual growth rates and the amount and timing of expected future cash flows. The cash flows employed in the DCF analysis for each reporting unit are based on the reporting unit's budget, long-term business plan and recent operating performance. Discount rate assumptions are based on an assessment of the risk inherent in the future cash flows of the respective reporting unit and market conditions. Given the inherent uncertainty in determining the assumptions underlying a DCF analysis, actual results may differ from those used in the Company's valuations. In assessing the reasonableness of the determined fair values, the Company also reconciled the aggregate determined fair value of the Company to the Company's market capitalization, which, at the date of its 2021 impairment test, included a 16 percent control discount. Significant assumptions used in the DCF analysis included long-term revenue growth rates. As a result of the analyses, no impairment was identified.

Capitalized Software Costs

The Company follows ASC 350-40, Intangibles – Goodwill and Other, Internal-Use Software, in accounting for internally developed software. Costs for internal use software are evaluated by projected and capitalized where appropriate.

Other Intangible Assets

Other intangible assets include software technology, customer relationships and other intangible assets acquired from other independent parties. Other intangible assets with a definite life are amortized over a period ranging from two to 12 years on a straight line basis, and are tested for impairment whenever events or circumstances indicate that the carrying amount of an asset (asset group) may not be recoverable. An impairment loss is recognized when the carrying amount of an asset exceeds the estimated undiscounted cash flows generated by the asset. The amount of the impairment loss recorded is calculated by the excess of the asset’s carrying value over its fair value.

Accounting for long-lived assets

The Company periodically reviews the carrying amount of its property, equipment and leasehold improvements to determine if circumstances exist indicating an impairment or if depreciation periods should be modified. If facts or circumstances indicate that an impairment may exist, the Company will prepare a projection of the undiscounted future cash flows of the specific assets to determine if the assets are recoverable. If impairment exists based on these projections, an adjustment will be made to reduce the carrying amount of the specific assets to fair value.

Revenue recognition

The Company recognizes revenue for its internal and outsourced manufacturing operations in accordance with ASC 606, Revenue from Contracts with Customers. The Company manufactures custom parts to specific customer orders that have no alternative use to the Company, and the Company believes there is a legally enforceable right to payment for performance completed to date on internally and outsourced manufactured parts. For manufactured parts that meet these two criteria, the Company will recognize revenue over time. Revenue is recognized over time using the input method based on time in production as a percentage of total estimated production time to measure progress toward satisfying performance obligations using the estimated total time necessary to complete the parts per the customer's order and an estimate of inventory and production costs incurred to date. The input method requires an analysis of the incurred time in production and an estimate of the total time necessary to complete the total parts per the customer's order. The majority of the Company’s injection molding contracts have multiple performance obligations including one obligation to produce the mold and a second obligation to produce parts. For injection molding contracts with multiple performance obligations, the Company allocates revenue to each performance obligation based on its relative standalone selling price. The Company generally determines standalone selling price based on the price charged to customers.

Leases

The Company accounts for leases in accordance with ASC 842, Leases, which requires the balance sheet recognition of lease assets and lease liabilities by lessees for those leases classified as operating and finance leases. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease assets, current operating lease liabilities and long-term operating lease liabilities in the Consolidated Balance Sheets and are recognized based on the present value of lease payments over the lease term at the commencement date. Finance leases are included in finance lease assets, current finance lease liabilities and long-term finance lease liabilities in the Consolidated Balance Sheets and are recognized based on the present value of lease payments over the lease term at commencement date. The majority of the Company’s leases do not provide an implicit rate of return, therefore, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lease agreements that contain non-lease components, with the exception of certain real estate leases, are accounted for as a single lease component.

The Company has operating leases for office space, manufacturing facilities and certain company vehicles and equipment and finance leases for certain company equipment. The leases have remaining lease terms of one year to eight years. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. For purposes of calculating operating lease liabilities, lease terms may be deemed to include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. As of December 31, 2021, the operating lease liability does not include any options to extend or terminate leases.

Income taxes

The Company accounts for income taxes in accordance with ASC 740, Income Taxes (ASC 740). Under this method, the Company determines tax assets and liabilities based upon the differences between the financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. The tax consequences of most events recognized in the financial statements are included in determining income taxes currently payable. However, because tax laws and financial accounting standards differ in their recognition and measurement of assets, liabilities and equity, revenues, expenses, gains and losses, differences arise between the amount of taxable income and pretax financial income for a year and between the tax basis of assets or liabilities and their reported amounts in the financial statements. Because the Company assumes that the reported amounts of assets and liabilities will be recovered and settled, respectively, a difference between the tax basis of an asset or liability and its reported amount in the balance sheet will result in a taxable or a deductible amount in some future years when the related liabilities are settled or the reported amounts of the assets are recovered, giving rise to a deferred tax asset or liability. The Company establishes a valuation allowance for any portion of its deferred tax assets that the Company believes may not be recognized.

ASC 740 also clarifies the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements by requiring that individual tax positions are recorded only when they meet a more-likely-than-not criterion. The Company recognizes the effect of income tax positions only if sustaining those positions is more likely than not. The Company records penalties and interest related to unrecognized tax benefits in income taxes in the Company’s Consolidated Statements of Income.

Stock-based compensation

The Company accounts for stock-based compensation in accordance with ASC 718, Compensation—Stock Compensation (ASC 718). Under the fair value recognition provisions of ASC 718, the Company measures stock-based compensation cost at the grant date fair value and recognizes the compensation expense over the requisite service period, which is the vesting period, using a straight-line attribution method. The amount of stock-based compensation expense recognized during a period is based on the portion of the awards that are ultimately expected to vest. The Company accounts for forfeitures as they occur. Ultimately, the total expense recognized over the vesting period will only be for those awards that vest. The Company’s awards are not eligible to vest early in the event of retirement, however, the awards vest early in the event of a change in control.

In determining the compensation cost of the options granted, the fair value of options granted has been estimated on the date of grant using the Black-Scholes option-pricing model.

Advertising costs

Advertising is expensed as incurred and was approximately $11.6 million, $11.5 million and $13.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Research and development

Research and development expenses consist primarily of personnel and outside service costs related to the development of new processes and product lines, enhancements of existing product lines, development of software for internal use, maintenance of internally developed software, quality assurance and testing. Costs for internal use software are evaluated by project and capitalized where appropriate under ASC 350-40, Intangibles - Goodwill and Other, Internal-Use Software. Research and development costs were approximately $44.2 million, $36.9 million and $32.7 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Foreign currency translation/transactions

The Company translated the balance sheets of its foreign subsidiaries at period-end exchange rates and the income statement at the average exchange rates in effect throughout the period. The Company has recorded the translation adjustment as a separate component of consolidated shareholders’ equity. Foreign currency transaction gains and losses are recognized in the Consolidated Statements of Comprehensive Income.

Recently adopted accounting pronouncements

In December 2019, the Financial Accounting Standards Board issued Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12). ASU 2019-12 attempts to simplify aspects of accounting for franchise taxes and enacted changes in tax laws or rates, and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 is effective for public business entities for fiscal years beginning after December 15, 2020, including interim periods within that fiscal year. The Company adopted ASU 2019-12 on January 1, 2021 and there was no material impact on the Company’s consolidated financial statements.

Note 3 - Revenue

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Text Block]

Note 3 – Revenue

The Company accounts for revenue in accordance with ASC 606, Revenue from Contracts with Customers. The Company provides quality, quick-turn prototyping and on-demand manufacturing services. As a result, the majority of revenue recognized in a reporting period is based on completed, invoiced contracts.

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC 606. The majority of the Company’s CNC machining, 3D printing, and sheet metal contracts have a single performance obligation. The majority of the Company’s injection molding contracts have multiple performance obligations including one obligation to produce the mold and a second obligation to produce parts. For injection molding contracts with multiple performance obligations, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling price based on the price charged to customers.

The Company manufactures parts that have no alternative use to the Company since the parts are custom made to specific customer orders, and the Company believes there is a legally enforceable right to payment for performance completed to date on these manufactured parts. For manufactured parts that meet these two criteria, the Company will recognize revenue over time. Revenue is recognized over time using the input method based on time in production as a percentage of total estimated production time to measure progress toward satisfying performance obligations using the estimated total time necessary to complete the parts per the customer's order and an estimate of inventory and production costs incurred to date. The input method requires an analysis of the incurred time in production and an estimate of the total time necessary to complete the total parts per the customer's order.

Revenue by geographic region for the years ended December 31, 2021, 2020 and 2019 was as follows:

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
United States	$	384,458	$	345,708	$	360,205
Europe		90,399		74,796		82,805
Japan		13,241		13,891		15,718
Total revenue	$	488,098	$	434,395	$	458,728

Revenue by product line for the years ended December 31, 2021, 2020 and 2019 was as follows:

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
Injection Molding	$	226,117	$	217,992	$	217,415
CNC Machining		166,811		131,587		155,473
3D Printing		72,721		62,502		61,352
Sheet Metal		20,397		18,838		21,000
Other Revenue		2,052		3,476		3,488
Total revenue	$	488,098	$	434,395	$	458,728

The Company generally expenses sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within marketing and sales expenses. The value of unsatisfied performance obligations for contracts with an original expected length of one year or less is not material.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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Note 4 - Net Income Per Common Share

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Text Block]

Note 4 – Net Income Per Common Share

Basic net income per share is computed based on the weighted average number of common shares outstanding. Diluted net income per share is computed based on the weighted average number of common shares outstanding, increased by the number of additional shares that would have been outstanding had the potentially dilutive common shares been issued and reduced by the number of shares the Company could have repurchased from the proceeds from issuance of the potentially dilutive shares. Potentially dilutive shares of common stock include stock options and other stock-based awards granted under stock-based compensation plans and shares committed to be purchased under the employee stock purchase plan. For the year ended December 31, 2021, 113,043 anti-dilutive options were excluded from the calculation of diluted weighted average shares outstanding.

The following table presents the calculation of net income per basic and diluted share attributable to common shareholders:

	*Year Ended December 31,*
(in thousands, except share and per share amounts)	*2021*		*2020*		*2019*

Net Income	$	33,372	$	50,867	$	63,655

Basic - weighted-average shares outstanding:		27,617,627		26,737,425		26,866,985
Effect of dilutive securities:
Employee stock options and other		35,472		158,932		182,438
Diluted - weighted-average shares outstanding:		27,653,099		26,896,357		27,049,423
Net income per share attributable to common shareholders:
Basic	$	1.21	$	1.90	$	2.37
Diluted	$	1.21	$	1.89	$	2.35

Note 5 - Business Combinations

12 Months Ended

Dec. 31, 2021

Business Combination Disclosure [Text Block]

Note 5 – Business Combinations

On January 22, 2021, the Company acquired all of the outstanding shares of 3D Hubs, Inc. (Hubs), for $294.1 million, consisting of $127.4 million in cash and 863,995 shares of the Company's common stock valued at $166.7 million on the closing date. The purchase agreement included additional contingent consideration of up to $52.8 million subject to the achievement of performance-based targets during fiscal 2021 and fiscal 2022. The contingent consideration consisted of up to $25.0 million in cash and up to 143,983 shares of the Company's common stock valued at $27.8 million on the closing date.

Hubs is based in Amsterdam, Netherlands and is a leading online manufacturing platform that provides customers with on-demand access to a global network of premium manufacturing partners. The acquisition enhances the Company’s value proposition by expanding the customer offerings, enabling the Company to more holistically serve its customers.

The fair value of the consideration paid for this acquisition has been allocated to the assets purchased and liabilities assumed based on their fair values as of the acquisition date, with any excess recorded as goodwill. The goodwill associated with the acquisition represents both the strategic and growth opportunities by significantly expanding the customer offering with a network of premium manufacturing partners. The goodwill related to the acquisition is not deductible for tax purposes.

The Company recorded a contingent consideration liability of $13.6 million as of the acquisition date representing the estimated fair value of the amounts payable to former shareholders, as outlined under the terms of the merger agreement, payable subject to the satisfaction of performance-based targets during fiscal year 2021 and fiscal year 2022, as noted above. The fair value of the contingent consideration (Level 3) was determined using a Monte Carlo pricing model. During the year ended December 31, 2021, the Company reversed all previously recorded contingent consideration due to the performance-based targets not being met for fiscal 2021 and those targets would not be met during fiscal 2022. The reversal of the contingent consideration was recorded as a decrease in general and administrative expense in the Consolidated Statements of Comprehensive Income.

The results of Hubs since the date of acquisition have been included within the Company's results. Pro forma disclosures of the consolidated results of the Company with the full year effects of Hubs, as if the acquisition had occurred on January 1, 2020, are not required and have not been separately presented since the impact to the Company's results of operations was not material.

The acquisition has been accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Throughout fiscal 2021 the Company recorded adjustments to the preliminary allocation of the purchase price due to changes to the preliminary valuation and finalization of the working capital calculation. Adjustments from the original amounts recorded included a $3.9 million decrease to intangible assets, a $5.5 million increase to goodwill, a $3.3 million increase to contingent consideration, a $1.4 million decrease to deferred tax liabilities, and a decrease to cash paid of $0.3 million. The final purchase price allocation is as follows:

(in thousands)
Assets acquired:
Current assets	$	2,497
Intangible assets		30,770
Goodwill		280,925
Other long-term assets		1,139
Total assets acquired		315,331

Liabilities assumed:
Current contingent consideration		7,093
Current liabilities		5,666
Long-term contingent consideration		6,507
Long-term deferred tax liabilities		1,688
Other long-term liabilities		255
Total liabilities assumed		21,209
Net assets acquired	$	294,122

Cash paid	$	133,847
Cash acquired		(6,434	)
Net cash consideration		127,413
Equity portion of purchase price		166,709
Total purchase consideration	$	294,122

Note 6 - Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Text Block]

Note 6 – Goodwill and Other Intangible Assets

The changes in the carrying amount of goodwill for the years ended December 31, 2021 and 2020 were as follows:

(in thousands)	Dec. 31, 2019		Goodwill acquired during 2020		Dec. 31, 2020		Goodwill acquired during 2021		Foreign currency translation adjustments during 2021			Dec. 31, 2021

United States	$	123,883	$	-	$	123,883	$	151,276	$	-		$	275,159
Europe		4,239		-		4,239		129,649		(9,067	)		124,821
Japan		630		-		630		-		-			630
Total goodwill	$	128,752	$	-	$	128,752	$	280,925	$	(9,067	)	$	400,610

Goodwill increased $280.9 million for the year ended December 31, 2021 as a result of our acquisition of Hubs. Goodwill has been allocated to the acquired Hubs entities consisting of goodwill of €106.5 million in Europe and $151.3 million in the United States as of the date of the acquisition. The Euro denominated goodwill is translated at the end of each period using the current exchange rates resulting in a foreign currency translation adjustment that is recorded as a component of Other Comprehensive Income.

Intangible assets other than goodwill for the years ended December 31, 2021 and 2020 were as follows:

	*Year Ended December 31, 2021*							*Year Ended December 31, 2020*									*Weighted Average Useful Life*
(in thousands)	*Gross*		*Accumulated Amortization*			*Net*		*Gross*		*Accumulated Amortization*			*Net*		*Useful Life (in years)*		*Remaining (in years)*

Marketing assets	$	930	$	(713	)	$	217	$	930	$	(620	)	$	310		10.0		2.3
Non-compete agreement		842		(363	)		479		270		(238	)		32		2.0 - 5.0		2.9
Software technology		13,229		(5,014	)		8,215		13,229		(3,645	)		9,584		10.0		6.5
Software platform		26,725		(2,262	)		24,463		-		-			-		12.0		11.1
Tradenames		359		(114	)		245		-		-			-		3.0		2.1
Customer relationships		12,252		(7,873	)		4,379		10,070		(5,646	)		4,424		3.0 - 9.0		1.8
Total intangible assets	$	54,337	$	(16,339	)	$	37,998	$	24,499	$	(10,149	)	$	14,350

Amortization expense for intangible assets for the years ended December 31, 2021, 2020 and 2019 was $6.2 million, $3.0 million and $3.5 million, respectively. The Euro denominated intangible assets are translated at the end of each period using the current exchange rates resulting in a foreign currency translation adjustment that is recorded as a component of Other Comprehensive Income. For the year ended December 31, 2021, the foreign currency translation adjustment was $0.9 million. There were no foreign currency translation adjustments for the years ended December 31, 2020 and 2019.

Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows:

(in thousands)	*Estimated Amortization Expense*
2022	$	6,172
2023		5,968
2024		3,790
2025		3,690
2026		3,586
Thereafter		14,792
Total estimated amortization expense	$	37,998

Note 7 - Fair Value Measurements

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Text Block]

Note 7 – Fair Value Measurements

ASC 820, Fair Value Measurement (ASC 820), defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy which requires classification based on observable and unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company's assets and liabilities that are required to be measured or disclosed at fair value on a recurring basis include cash and cash equivalents and marketable securities. The Company’s cash consists of bank deposits. The Company’s cash equivalents measured at fair value consist of money market mutual funds. The Company determines the fair value of these investments using Level 1 inputs. The Company's marketable securities consist of short-term and long-term agency, municipal, corporate and other debt securities. Fair value for the corporate debt securities is primarily determined based on quoted market prices (Level 1). Fair values for the U.S. municipal securities, U.S. government agency securities, certificates of deposit and U.S. treasury securities are primarily determined using dealer quotes or quoted market prices for similar securities (Level 2). The Company's contingent consideration is the current fair value estimate of amounts owed to the former shareholders of Hubs and is determined using the Monte Carlo pricing model (Level 3). The Company had no contingent consideration as of December 31, 2021.

The following tables summarizes financial assets as of December 31, 2021 and 2020 measured at fair value on a recurring basis:

	*December 31, 2021*						*December 31, 2020*
(in thousands)	*Level 1*		*Level 2*		*Level 3*		*Level 1*		*Level 2*		*Level 3*

Financial Assets:
Cash and cash equivalents	$	65,637	$	-	$	-	$	72,225	$	-	$	-
Money market mutual fund		292		-		-		55,378		-		-
Marketable securities		7,602		18,318		-		-		-		-
Total	$	73,531	$	18,318	$	-	$	127,603	$	-	$	-

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 8 - Marketable Securities

12 Months Ended

Dec. 31, 2021

Investment [Text Block]

Note 8 – Marketable Securities

The Company invests in short-term and long-term agency, municipal, corporate and other debt securities. As of December 31, 2021, the securities are categorized as available-for-sale and are recorded at fair value. As of December 31, 2020, the securities were categorized as held-to-maturity and were recorded at amortized cost, net of an allowance for credit losses. The change in categorization was a result of the sale of securities in the first quarter of 2021 in order to partially fund the acquisition of Hubs and did not have a material impact on our financial statements.

Information regarding the Company’s short-term and long-term marketable securities as of December 31, 2021 and 2020 is as follows:

	*December 31, 2021*
(in thousands)	*Amortized Cost*		*Unrealized Gains*		*Unrealized Losses*			*Fair Value*

U.S. government agency securities	$	2,500	$	-	$	(12	)	$	2,488
Corporate debt securities		9,303		-		(44	)		9,259
U.S. municipal securities		12,549		-		(70	)		12,479
Commercial paper		-		-		-			-
Certificates of deposit/time deposits		1,687		7		-			1,694
Total marketable securities	$	26,039	$	7	$	(126	)	$	25,920

	*December 31, 2020*
(in thousands)	*Amortized Cost*		*Unrealized Gains*		*Unrealized Losses*			*Fair Value*

U.S. government agency securities	$	18,500	$	6	$	(10	)	$	18,496
Corporate debt securities		42,048		211		(11	)		42,248
U.S. municipal securities		25,003		83		(2	)		25,084
Commercial paper		2,499		-		-			2,499
Certificates of deposit/time deposits		5,395		93		-			5,488
Total marketable securities	$	93,445	$	393	$	(23	)	$	93,815

Fair values for the corporate debt securities are primarily determined based on quoted market prices (Level 1). Fair values for the U.S. government agency securities, U.S. municipal securities, commercial paper and certificates of deposit are primarily determined using dealer quotes or quoted market prices for similar securities (Level 2).

During the first quarter of 2020, the Company adopted the FASB ASU 2016-13, Financial Instruments – Credit Losses. The Company calculated the expected credit loss for each security in its portfolio using the probability-of-default method. The Company concluded the adoption of the guidance had no material impact on its consolidated financial statements.

Classification of marketable securities as current or non-current is based upon the security’s maturity date as of the date of these financial statements.

The December 31, 2021 balance of available-for-sale debt securities by contractual maturity is shown in the following table at fair value. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

	*December 31,*
(in thousands)	*2021*

Due in one year or less	$	11,580
Due after one year through five years		14,340
Total marketable securities	$	25,920

Note 9 - Property and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment Disclosure [Text Block]

Note 9 – Property and Equipment

Property and equipment consists of the following:

	*December 31,*
(in thousands)	*2021*			*2020*

Land	$	15,009		$	14,028
Buildings and improvements		107,241			77,285
Machinery and equipment		234,900			221,301
Computer hardware and software		81,889			79,207
Leasehold improvements		8,373			7,821
Construction in progress		14,489			33,780
Total		461,901			433,422
Accumulated depreciation and amortization		(181,555	)		(150,756	)
Property and equipment, net	$	280,346		$	282,666

Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was $34.3 million, $29.6 million and $27.4 million, respectively.

Note 10 - Inventory

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Text Block]

Note 10 – Inventory

Inventory consists primarily of raw materials, which are recorded at the lower of cost or market using the standard cost method, which approximates first-in, first-out (FIFO) cost. The Company periodically reviews its inventory for slow-moving, damaged and discontinued items and provides allowances to reduce such items identified to their recoverable amounts.

The Company’s inventory consists of the following:

	*December 31,*
(in thousands)	*2021*			*2020*

Total inventory		13,474			11,122
Allowance for obsolescence		(313	)		(260	)
Inventory, net of allowance	$	13,161		$	10,862

Note 11 - Financing Obligations

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Text Block]

Note 11 – Financing Obligations

The Company had no financing obligations as of December 31, 2021 and 2020.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Note 12 - Employee Benefit Plans

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Text Block]

Note 12 – Employee Benefit Plans

The Company maintains a 401(k) retirement plan that covers employees in the United States. Under the plan, a full-time or regular part-time (over 20 hours/week) employee becomes a participant after completing three months of employment. Employees may elect to contribute up to 50 percent of regular gross pay, subject to federal law limits on the dollar amount that participants may contribute to the plan, each calendar year. The Company matches part of the employee contributions and may make a discretionary contribution to the plan. Total employer contributions were approximately $3.7 million, $3.3 million and $3.1 million for the years ended December 31, 2021, 2020 and 2019, respectively.

The Company also sponsors a defined contribution retirement plan that covers the employees in the United Kingdom. Total employer contributions were approximately $0.4 million, $0.5 million and $0.3 million for the years ended December 31, 2021, 2020 and 2019, respectively.

The entire disclosure for retirement benefits.

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Note 13 - Stock-based Compensation

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Text Block]

Note 13 – Stock-Based Compensation

The Company has two equity incentive plans: the 2000 Stock Option Plan (2000 Plan) and the 2012 Long-Term Incentive Plan (2012 Plan). Upon the adoption of the 2012 Plan on February 12, 2012, all shares that were reserved but not issued under the 2000 Plan were assumed by the 2012 Plan. No additional awards will be issued under the 2000 Plan. Under the 2012 Plan, the Company has the ability to grant stock options, stock appreciation rights (SARs), restricted stock, performance stock, stock units, other stock-based awards and cash incentive awards. Awards under the 2012 Plan have a maximum term of ten years from the date of grant. The compensation committee of the board of directors may provide that the vesting or payment of any award will be subject to the attainment of specified performance measures in addition to the satisfaction of any continued service requirements, and the compensation committee will determine whether such measures have been achieved. The per share exercise price of stock options and SARs granted under the 2012 Plan generally may not be less than the fair market value of a share of our common stock on the date of the grant. Restricted stock is valued at fair market value on the date of grant.

The Company’s 2012 Employee Stock Purchase Plan (ESPP) allows eligible employees to purchase a variable number of shares of the Company’s common stock at a discount through payroll deductions of up to 15 percent of their eligible compensation, subject to plan limitations. The ESPP provides for six-month offering periods with a single purchase period, and at the end of each offering period, employees are able to purchase shares at 85 percent of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last trading day of the offering period. The Company determines the fair value stock-based compensation related to its ESPP in accordance with ASC 718 using the component measurement approach and the Black-Scholes standard option pricing model.

Employees purchased 67,729 and 42,235 shares of common stock under the ESPP at an average exercise price of $61.96 and $85.85 during 2021 and 2020, respectively. As of December 31, 2021, 1,058,866 shares remained available for future issuance under the ESPP.

The Company determines its stock-based compensation in accordance with ASC 718, which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and non-employee directors based on fair value.

Determining the appropriate fair value model and calculating the fair value of stock option grants requires the input of subjective assumptions. The Company uses the Black-Scholes option pricing model to value its stock option awards. Stock-based compensation expense is calculated using the Company’s best estimates, which involve inherent uncertainties and the application of management’s judgment. Significant estimates include its expected term and stock price volatility.

The expected term of stock options is estimated from the vesting period of the award and represents the weighted average period that the Company's stock options are expected to be outstanding. The Company estimates the volatility of its stock price based on the historic volatility of its common stock. The Company bases the risk-free interest rate that it uses in the Black-Scholes option pricing model on U.S. Treasury instruments with maturities similar to the expected term of the award being valued. The Company has never paid and does not anticipate paying, any cash dividends in the foreseeable future and, therefore, the Company uses an expected dividend yield of zero in the option pricing model. The Company accounts for forfeitures as they occur. The Company recognizes stock-based compensation expense on a straight-line basis over the requisite service period.

The following table summarizes stock-based compensation expense for the years ended December 31, 2021, 2020 and 2019, respectively:

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*

Stock options and other	$	17,553	$	13,327	$	9,591
Employee stock purchase plan		1,542		1,346		1,190
Total stock-based compensation expense	$	19,095	$	14,673	$	10,781

Cost of revenue	$	2,595	$	2,451	$	2,056
Operating expenses:
Marketing and sales		3,736		3,121		2,632
Research and development		2,833		2,440		1,851
General and administrative		9,931		6,661		4,242
Total stock-based compensation expense	$	19,095	$	14,673	$	10,781

Stock Options

The following table provides the assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2021, 2020 and 2019:

	*Year Ended December 31,*
	*2021*		*2020*		*2019*

Risk-free interest rate		0.80 - 1.12%		0.50 - 1.47%		2.35 - 2.58%
Expected life (years)		6.25		6.25		6.25
Expected volatility		45.28 - 45.53%		42.40 - 43.83%		42.52 - 42.74%
Expected dividend yield		0%		0%		0%
Weighted average grant date fair value		$128.14		$45.32		$47.84

The following table summarizes stock option activity and the weighted average exercise price for the years ended December 31, 2021, 2020 and 2019:

				*Weighted-*
				*Average*
	*Stock Options*			*Exercise Price*

Options outstanding at January 1, 2019		252,616		$	64.71
Granted		53,708			105.81
Exercised		(16,079	)		48.67
Cancelled		(13,979	)		89.50
Options outstanding at December 31, 2019		276,266			72.38
Granted		60,065			105.79
Exercised		(68,958	)		57.00
Cancelled		(37,842	)		67.92
Options outstanding at December 31, 2020		229,531			86.46
Granted		57,901			128.14
Exercised		(28,991	)		58.78
Cancelled		(25,057	)		109.31
Options outstanding at December 31, 2021		233,384		$	97.78

Exercisable at December 31, 2021		115,700		$	81.30

The outstanding options have a term of 10 years. For employees, options that have been granted become exercisable ratably over the vesting period, which is generally a four- or five-year period, beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, options generally become exercisable in full on the first anniversary of the grant date.

The total intrinsic value of options exercised during the years ended December 31, 2021, 2020 and 2019, was $3.8 million, $5.4 million and $0.9 million, respectively. The aggregate intrinsic value represents the cumulative difference between the fair market value of the underlying common stock and the option exercise prices.

For options outstanding at December 31, 2021, the weighted-average remaining contractual term was 6.7 years and the aggregate intrinsic value was $0.1 million. For options exercisable at December 31, 2021, the weighted-average remaining contractual term was 5.0 years and the aggregate intrinsic value was $0.1 million. Refer to the table below for additional information.

The following table summarizes information about stock options outstanding at December 31, 2021:

	Options Outstanding, Vested and Expected to Vest			Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price ($)	Number Exercisable	Weighted Average Exercise Price ($)

$7.76 to $31.43	4,624	0.35	30.58	4,624	30.58
$31.44 to $66.87	50,159	3.58	57.13	45,986	57.02
$66.88 to $96.20	41,586	7.82	89.95	9,570	71.68
$96.21 to $180.46	137,015	7.67	117.31	55,520	107.28

The fair value of share-based payment transactions is recognized in the Consolidated Statements of Comprehensive Income. As of December 31, 2021, there was $4.3 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 2.6 years. The total fair value of options vested was $2.1 million, $1.8 million and $1.5 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Restricted Stock

The 2012 Plan provides for the award of restricted stock or restricted stock units. Restricted stock awards are share settled and restrictions lapse ratably over the vesting period, which is generally a three- to five-year period, beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, restrictions generally lapse in full on the first anniversary of the grant date.

The following table summarizes restricted stock activity for the years ended December 31, 2021, 2020 and 2019:

				*Weighted-*
				*Average*
				*Grant Date*
	*Restricted*			*Fair Value*
	*Stock Awards*			*Per Share*

Restricted stock at January 1, 2019		323,921		$	79.85
Granted		115,471			106.35
Restrictions lapsed		(92,597	)		77.25
Forfeited		(31,822	)		87.58
Restricted stock at December 31, 2019		314,973			89.55
Granted		108,179			111.76
Restrictions lapsed		(101,941	)		84.70
Forfeited		(14,012	)		94.24
Restricted stock at December 31, 2020		307,199			98.87
Granted		205,996			123.61
Restrictions lapsed		(115,908	)		91.26
Forfeited		(53,505	)		128.05
Restricted stock at December 31, 2021		343,782		$	111.79

As of December 31, 2021, there was $26.0 million of unrecognized compensation expense related to non-vested restricted stock, which is expected to be recognized over a weighted-average period of 2.4 years.

Performance Stock

Performance stock units (PSUs) are expressed in terms of a target number of PSUs, with anywhere between 0 percent and 150 percent of that target number capable of being earned and vesting at the end of a three-year performance period depending on the Company’s performance in the final year of the performance period and the award recipient’s continued employment. The Company’s PSUs granted from 2017 to 2019 and certain PSUs granted in 2021 are based on performance conditions and the related compensation cost is based on the probability that the performance conditions will be achieved. The Company’s PSUs granted in 2020 and certain PSUs granted in 2021 are based on market conditions and the related compensation cost is based on the fair value at grant date calculated using a Monte Carlo pricing model.

The following table summarizes performance stock activity for the years ended December 31, 2021, 2020 and 2019:

				*Weighted-*
				*Average*
				*Grant Date*
	*Performance*			*Fair Value*
	*Stock Awards*			*Per Share*

Performance stock at January 1, 2019		52,140		$	76.54
Granted		21,434			104.99
Restrictions lapsed		-			-
Performance change		(61,816	)		88.06
Forfeited		(2,375	)		105.37
Performance stock at December 31, 2019		9,383			58.35
Granted		19,956			118.66
Restrictions lapsed		(7,113	)		58.35
Performance change		-			-
Forfeited		(2,270	)		58.35
Performance stock at December 31, 2020		19,956			118.66
Granted		15,078			203.64
Restrictions lapsed		-			-
Performance change		(10,366	)		192.95
Forfeited		(7,829	)		113.91
Performance stock at December 31, 2021		16,839		$	115.56

As of December 31, 2021, there was $0.8 million of unrecognized compensation expense related to non-vested performance stock, which is expected to be recognized over a weighted-average period of 1.8 years.

Employee Stock Purchase Plan

The following table presents the assumptions used to estimate the fair value of the ESPP during the years ended December 31, 2021, 2020 and 2019:

	*Year Ended December 31,*
	*2021*	*2020*	*2019*

Risk-free interest rate	0.06 - 0.17%	0.12 - 0.17%	1.59 - 2.35%
Expected life (months)	6.00	6.00	6.00
Expected volatility	53.44 - 65.53%	50.85 - 59.99%	42.63 - 53.57%
Expected dividend yield	0%	0%	0%

Note 14 - Leases

12 Months Ended

Dec. 31, 2021

Lessee, Operating Leases and Financing Leases [Text Block]

Note 14 – Leases

Supplemental balance sheet information related to leases was as follows:

	*December 31,*
(in thousands)	*2021*		*2020*
Operating lease assets	$	5,578	$	9,855

Current operating lease liabilities	$	3,298	$	3,272
Long-term operating lease liabilities		2,245		7,586
Total operating lease liabilities	$	5,543	$	10,858


Finance lease assets	$	1,898	$	2,396

Current finance lease liabilities	$	550	$	552
Long-term finance lease liabilities		1,351		1,919
Total finance lease liabilities	$	1,901	$	2,471

Lease expense is recognized on a straight-line basis over the lease term, with variable payments recognized in the period those payments are incurred. The components of lease expense for the periods reported were as follows:

	*Twelve Months Ended December 31,*
(in thousands)	*2021*		*2020*
Operating lease cost	$	3,391	$	4,191
Finance lease cost:
Amortization of right-of-use assets	$	498	$	143
Interest on lease obligations	$	9	$	2
Variable lease cost		719		989
Total lease cost	$	4,617	$	5,325

Maturities of operating and finance lease liabilities as of December 31, 2021 were as follows:

(in thousands)	*Operating Leases*			*Finance Leases*
Year Ending December 31,
2022	$	2,550		$	561
2023		1,308			1,352
2024		751			-
2025		711			-
2026		344			-
After 2027		-			-
Total future minimum lease payments		5,664			1,913
Less interest		(121	)		(12	)
Present value of lease liabilities	$	5,543		$	1,901

As of December 31, 2021, we have no operating or finance leases that have not yet commenced.

Weighted average remaining lease term and discount rate was as follows:

	*December 31,*
	*2021*			*2020*
Weighted Average Remaining Lease Term - operating leases (years)		3.1			4.4
Weighted Average Remaining Lease Term - finance leases (years)		1.5			2.5
Weighted Average Discount Rate - operating leases		1.6	%		2.6	%
Weighted Average Discount Rate - finance leases		0.4	%		0.5	%

Supplemental cash flow information related to leases was as follows:

	*Twelve Months Ended December 31,*
(in thousands)	*2021*		*2020*
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	10,477	$	4,426
Operating cash flows from finance leases	$	9	$	2
Financing cash flows from finance leases	$	552	$	154

Lease assets obtained in exchange for new operating lease liabilities		5,293		1,506
Lease assets obtained in exchange for new financing lease liabilities		-		2,523

Note 15 - Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2021

Disclosure of Reclassification Amount [Text Block]

Note 15 – Accumulated Other Comprehensive Loss

Other comprehensive loss is comprised of foreign currency translation adjustments and net unrealized gains (losses) on investments in securities. The following table presents the changes in accumulated other comprehensive loss balances for the years ending December 31, 2021, 2020 and 2019, respectively:

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*

Balance at beginning of period	$	(3,420	)	$	(7,018	)	$	(8,492	)
Foreign currency translation adjustments
Other comprehensive (loss) income before reclassifications		(13,278	)		3,598			1,474
Amounts reclassified from accumulated other comprehensive income (loss)		-			-			-
Net current-period other comprehensive (loss) income		(13,278	)		3,598			1,474
Net unrealized gains (losses) on investments in securities
Other comprehensive (loss) income before reclassifications		(119	)		-			-
Amounts reclassified from accumulated other comprehensive income (loss)		-			-			-
Net current-period other comprehensive (loss) income		(119	)		-			-
Balance at end of period	$	(16,817	)	$	(3,420	)	$	(7,018	)

Note 16 - Income Taxes

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Text Block]

Note 16 – Income Taxes

The Company is subject to income tax in multiple jurisdictions and the use of estimates is required to determine the provision for income taxes. For the years ended December 31, 2021, 2020 and 2019, the Company recorded an income tax provision of $6.8 million, $12.1 million and $17.5 million, respectively. The effective income tax rate for the years ended December 31, 2021, 2020 and 2019 was 17.0 percent, 19.2 percent and 21.6 percent, respectively.

The effective tax rate decreased by 2.2% for the year ended December 31, 2021 when compared to 2020 primarily due to a one-time benefit from the revaluation of contingent consideration and a benefit from the decrease in the tax liability for uncertain tax positions resulting from the expiration of the statute of limitations. These benefits were partially offset by an increase in the valuation allowances on losses from foreign operations.

The Coronavirus Aid, Relief, and Economic Security (CARES) Act was signed into law on March 27, 2020. The CARES Act was meant to infuse companies with various income and payroll tax cash benefits to ease the impact of the pandemic. A technical correction to the Tax Cuts and Jobs Act of 2017 was included in the CARES Act allowing qualified improvement property to claim bonus depreciation for respective assets placed in service in 2018 and 2019. The impact of the CARES Act to the Company was a $2.9 million reduction to income taxes payable and a corresponding increase to deferred tax liability for the year ended December 31, 2020. In addition, the Company elected to defer deposits of the employer portion of the Social Security tax for the quarter ended March 31, 2020 through the quarter ended December 31, 2020. The Social Security taxes deferred in 2020 were paid in 2021.

The provision for income taxes is based on income before income taxes reported for financial statement purposes. The components of income before income taxes are as follows:

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*		*2019*

Domestic	$	42,449		$	58,551	$	74,841
Foreign		(2,265	)		4,394		6,352
Total	$	40,184		$	62,945	$	81,193

Significant components of the provision for income taxes for the following periods are as follows:

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*

Current:
Federal	$	5,552		$	2,128		$	6,991
State		975			1,136			2,882
Foreign		(64	)		1,241			1,544
Deferred
Federal		(377	)		6,904			5,121
State		(814	)		(431	)		269
Foreign		(1,181	)		210			(809	)
Valuation Allowance		2,721			890			1,540
Total	$	6,812		$	12,078		$	17,538

A reconciliation of the federal statutory income tax rate to the effective tax rate is as follows:

	*Year Ended December 31,*
	*2021*			*2020*			*2019*

Federal tax statutory rate		21.0	%		21.0	%		21.0	%
State tax (net of federal benefit)		2.1			2.1			2.1
Share based compensation		(2.3	)		(1.3	)		(0.5	)
Valuation allowance against deferred tax assets		8.9			2.0			1.4
Contingent consideration reduction		(7.0	)		-			-
Research and development credit		(4.0	)		(3.7	)		(2.8	)
Foreign rate differential		(2.2	)		(0.8	)		(0.3	)
Tax reserves		(1.0	)		1.4			1.1
Provision to return difference		(0.7	)		(1.4	)		-
Miscellaneous		2.2			(0.1	)		(0.4	)
Total		17.0	%		19.2	%		21.6	%

Significant components of deferred tax assets and liabilities are as follows:

	*December 31,*
(in thousands)	*2021*			*2020*

Deferred tax assets:
Accrued expenses	$	2,511		$	2,155
Leases		1,830			3,598
Warrants and stock options		4,271			3,356
Intangible assets		-			1,693
Inventories		205			172
Research and development credit		2,126			1,661
Other assets		1,111			129
Net operating loss		14,046			6,647
Less valuation allowance		(13,999	)		(9,138	)
Total deferred tax assets		12,101			10,273
Deferred tax liabilities:
Depreciation		(31,897	)		(32,671	)
Goodwill		(9,872	)		(7,858	)
Intangible assets		(4,394	)		-
Leases		(1,830	)		(3,598	)
Total deferred tax liabilities		(47,993	)		(44,127	)
Net deferred tax liability	$	(35,892	)	$	(33,854	)

The Company has recorded no U.S. deferred taxes related to the undistributed earnings of its non-U.S. subsidiaries as of December 31, 2021. Such amounts are intended to be reinvested outside of the United States indefinitely. It is not practicable to estimate the amount of additional tax that might be payable on the foreign earnings. As of December 31, 2021, the Company had accumulated undistributed earnings in non-U.S. subsidiaries of $2.7 million.

As of December 31, 2021, the Company had estimated net operating loss carry forwards of $14.0 million for tax purposes. The net operating losses relate to operations in Japan, Germany and Netherlands. Japan losses can be carried forward for up to ten years. The remaining Japan net operating losses begin to expire at various dates between 2022 and 2031. The Company’s Japan operations are taxed both by local authorities and in the U.S. Germany net operating losses may be carried forward without any time limitations but are limited to €1 million, plus 60 percent of taxable income exceeding €1 million. Netherlands net operating losses may be carried forward without any time limitations, but are limited to €1 million, plus 50 percent of taxable income exceeding €1 million.

The Company establishes valuation allowances for deferred tax assets when, after consideration of all positive and negative evidence, it is considered more-likely-than-not that a portion of the deferred tax assets will not be realized. The Company's valuation allowances of $14.0 million and $9.1 million at December 31, 2021 and 2020, respectively, reduce the carrying value of deferred tax assets associated with certain net operating loss carry forwards and other assets with insufficient positive evidence for recognition. The increase in the valuation allowance is primarily attributable to the Netherlands net operating losses acquired in 2021 via the Hubs acquisition.

The Company files a U.S. federal income tax return and income tax returns in various states and foreign jurisdictions. With a few exceptions, the Company is no longer subject to U.S. federal, state, or foreign income tax examinations by tax authorities for years before 2017.

The Company has liabilities related to unrecognized tax benefits totaling $4.4 million and $4.8 million at December 31, 2021 and 2020, respectively, that if recognized would result in a reduction of the Company’s effective tax rate. The liabilities are classified as other long-term liabilities in the accompanying consolidated balance sheets. The Company recognizes interest and penalties related to income tax matters in income tax expense and reports the liability in current or long-term income taxes payable as appropriate. Interest and penalties were immaterial for each of the years ended December 31, 2021, 2020 and 2019.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	*December 31,*
	*2021*			*2020*

Balance at beginning of period	$	4,830		$	4,598
Additions for tax positions of current year		491			324
Additions for tax positions of prior years		781			475
Decrease related to expiration of statutes of limitations		(1,738	)		(567	)
Balance at period end	$	4,364		$	4,830

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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Note 17 - Litigation

12 Months Ended

Dec. 31, 2021

Legal Matters and Contingencies [Text Block]

Note 17 – Litigation

From time to time, the Company may be subject to various legal proceedings and claims that arise in the ordinary course of its business. Although the results of litigation and claims cannot be predicted with certainty, the Company does not believe it is a party to any litigation the outcome of which, if determined adversely, would individually or in the aggregate be reasonably expected to have a material adverse effect on its business.

Note 18 - Segment Reporting

12 Months Ended

Dec. 31, 2021

Segment Reporting Disclosure [Text Block]

Note 18 – Segment Reporting

The Company’s reportable segments are based on the internal reporting used by the Company’s CEO, who is the chief operating decision maker (CODM), to assess operating performance and make decisions about the allocation of resources. The Company’s reportable segments are based upon geographic region, consisting of the United States and Europe. The Corporate Unallocated and Japan category includes non-reportable segments, as well as research and development and general and administrative costs that are global in nature and that the Company does not allocate directly to its operating segments.

Revenue in the United States is derived from Injection Molding, CNC Machining, 3D Printing and Sheet Metal product lines. Revenue in Europe is derived from Injection Molding, CNC Machining, and 3D Printing product lines. Revenue in Japan is derived from Injection Molding and CNC Machining product lines. Injection Molding revenue consists of sales of custom injection molds and injection-molded parts. CNC Machining revenue consists of sales of CNC-machined and lathe-turned customer parts. 3D Printing revenue consists of sales of 3D-printed parts. Sheet Metal revenue consists of sales of fabricated sheet metal parts.

The accounting policies of the reportable segments are the same as those described in Note 2 – Summary of Significant Accounting Policies. Intercompany transactions primarily relate to intercontinental activity and have been eliminated and are excluded from the reported amounts. The difference between income from operations and pre-tax income relates to foreign currency-related gains and losses and interest income on cash balances and investments, which are not allocated to business segments.

Beginning in 2020, the Company's CODM made a decision to view certain research and development costs by geographic region. As a result, costs previously included in the Corporate Unallocated and Japan category have been included in the respective geographic regions. All periods presented have been restated to reflect this change.

Revenue and income from operations by reportable segment are as follows:

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
United States	$	384,458	$	345,708	$	360,205
Europe		90,399		74,796		82,805
Japan		13,241		13,891		15,718
Total revenue	$	488,098	$	434,395	$	458,728

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*
Income from Operations:
United States	$	98,001		$	98,762		$	108,594
Europe		730			11,707			15,077
Corporate Unallocated and Japan		(58,389	)		(50,633	)		(43,815	)
Total income from operations	$	40,342		$	59,836		$	79,856

Total long-lived assets, expenditures for additions to long-lived assets and depreciation and amortization expense are as follows:

	*December 31,*		*December 31,*		*December 31,*
(in thousands)	*2021*		*2020*		*2019*
Long-lived assets:
United States	$	215,701	$	215,721	$	210,171
Europe		59,388		59,388		45,019
Japan		5,257		7,557		8,522
Total long-lived assets	$	280,346	$	282,666	$	263,712

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Expenditures for additions to long-lived assets:
United States	$	26,698	$	29,984	$	45,123
Europe		7,378		16,574		14,743
Japan		133		452		2,364
Total expenditures for additions to long-lived assets	$	34,209	$	47,010	$	62,230

Year Ended December 31,

(in thousands)

2021

2020

2019

Depreciation and Amortization:

United States
$ 31,642 $ 25,744 $ 24,767

Europe
7,101 5,024 4,746

Japan
1,745 1,826 1,351

Total depreciation and amortization
$ 40,488 $ 32,594 $ 30,864

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2021
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, as listed within “Organization and business” above. All intercompany accounts and transactions have been eliminated in consolidation.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income Components of comprehensive income include net income, foreign currency translation adjustments and net unrealized gains and losses on investments in securities. Comprehensive income is disclosed in the accompanying Consolidated Statements of Comprehensive Income and Consolidated Statements of Shareholders’ Equity.
Use of Estimates, Policy [Policy Text Block]	Accounting estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and related disclosures at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents Cash and cash equivalents include cash and other investments, including marketable securities, with maturities of three months or less at the date of purchase. The Company maintains its cash in bank deposit accounts, which, at times, may exceed federally insured limits. The Company has not experienced any losses on such accounts.
Marketable Securities, Policy [Policy Text Block]	Marketable securities As of December 31, 2021, marketable securities are categorized as available-for-sale and are recorded at fair value. In the first quarter of 2021, the Company sold held-to-maturity securities in order to partially fund the acquisition of Hubs. As a result of the sale, all remaining marketable securities were reclassified to available-for-sale securities and reported at fair value. Management determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. The classification of marketable securities as current or non-current is dependent upon the security’s maturity date. Securities with maturities of three months or less at the time of purchase are categorized as cash equivalents as described above. As of December 31, 2020, marketable securities included held-to-maturity debt securities recorded at amortized cost. Debt securities were classified as held-to-maturity when the Company had the positive intent and ability to hold the securities to maturity. Held-to-maturity securities were stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity computed under the effective interest method. Such amortization was included in other income, net. Interest on securities classified as held to maturity was included in other income, net. During the first quarter of 2020, the Company adopted the FASB ASU 2016-13, Financial Instruments – Credit Losses. The Company calculated the expected credit loss for each security in its portfolio using the probability-of-default method. The Company concluded the adoption of the guidance had no material impact on its consolidated financial statements.
Accounts Receivable [Policy Text Block]	Accounts receivable and allowance for doubtful accounts Accounts receivable are reported at the invoiced amount less an allowance for doubtful accounts. As of each balance sheet date, the Company evaluates its accounts receivable and establishes an allowance for doubtful accounts based on a combination of specific customer circumstances and credit conditions taking into account the history of write-offs and collections. A receivable is considered past due if payment has not been received within the period agreed upon in the invoice. Accounts receivable are written off after all collection efforts have been exhausted. Recoveries of trade receivables previously written off are recorded when received.
Inventory, Policy [Policy Text Block]	Inventory Inventory consists primarily of raw materials, which are recorded at the lower of cost or market, using the standard cost method, which approximates first-in, first-out (FIFO) cost. The Company periodically reviews its inventory for slow-moving, damaged and discontinued items and provides allowances to reduce such items identified to their recoverable amounts.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, equipment and leasehold improvements Property, equipment and leasehold improvements are stated at cost. Major improvements that substantially extend an asset’s useful life are capitalized. Repairs, maintenance and minor improvements are charged to operations as incurred. Depreciation, including amortization of leasehold improvements and assets recorded under capital leases, is calculated using the straight-line method over the estimated useful lives of the individual assets and ranges from 3 to 39 years. Manufacturing equipment is depreciated over 3 to 15 years, office furniture and equipment are depreciated over 3 to 7 years, computer hardware and software are depreciated over 3 to 5 years, building costs are depreciated over 39 years, leasehold improvements are depreciated over the estimated lives of the related assets or the life of the lease, whichever is shorter, and building and land improvements are depreciated over 10 to 39 years. Assets not in service are not depreciated until the asset is put into use. The Company follows ASC 350-40, Internal-Use Software, in accounting for internally developed software. As of December 31, 2021 and 2020, $49.4 million of software development costs were capitalized.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill The Company recognizes goodwill in accordance with ASC 350, Intangibles—Goodwill and Other. Goodwill is the excess of cost of an acquired entity over the amounts assigned to assets acquired and liabilities assumed in a business combination. Goodwill is allocated to the Company's reporting units, which are determined by the discrete financial information available for the component and whether it is regularly reviewed by segment management. The Company's reporting units are the United States, Europe and Japan. Goodwill is not amortized. Goodwill is tested for impairment annually at the beginning of the fourth quarter, and is tested for impairment between annual tests if an event occurs or circumstances change that would indicate the carrying amount may be impaired. An impairment charge for goodwill is recognized only when the estimated fair value of a reporting unit, including goodwill, is less than its carrying amount. In 2021, the Company performed a quantitative analysis based on the performance of Europe in 2021 and the amount of goodwill recorded during the year from the Hubs acquisition. The quantitative impairment test requires judgment, including the identification of reporting units, the assignment of assets, liabilities and goodwill to reporting units, and the determination of fair value of each reporting unit. The impairment test requires the comparison of the fair value of each reporting unit with its carrying amount, including goodwill. In performing the impairment test, the Company determined the fair value of its reporting units through a combination of the income approach by using discounted cash flow (DCF) analyses and the market approach through the guideline company method. Determining fair value requires the Company to make judgments about appropriate discount rates, perpetual growth rates and the amount and timing of expected future cash flows. The cash flows employed in the DCF analysis for each reporting unit are based on the reporting unit's budget, long-term business plan and recent operating performance. Discount rate assumptions are based on an assessment of the risk inherent in the future cash flows of the respective reporting unit and market conditions. Given the inherent uncertainty in determining the assumptions underlying a DCF analysis, actual results may differ from those used in the Company's valuations. In assessing the reasonableness of the determined fair values, the Company also reconciled the aggregate determined fair value of the Company to the Company's market capitalization, which, at the date of its 2021 impairment test, included a 16 percent control discount. Significant assumptions used in the DCF analysis included long-term revenue growth rates. As a result of the analyses, no impairment was identified.
Internal Use Software, Policy [Policy Text Block]	Capitalized Software Costs The Company follows ASC 350-40, Intangibles – Goodwill and Other, Internal-Use Software, in accounting for internally developed software. Costs for internal use software are evaluated by projected and capitalized where appropriate.
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Other Intangible Assets Other intangible assets include software technology, customer relationships and other intangible assets acquired from other independent parties. Other intangible assets with a definite life are amortized over a period ranging from two to 12 years on a straight line basis, and are tested for impairment whenever events or circumstances indicate that the carrying amount of an asset (asset group) may not be recoverable. An impairment loss is recognized when the carrying amount of an asset exceeds the estimated undiscounted cash flows generated by the asset. The amount of the impairment loss recorded is calculated by the excess of the asset’s carrying value over its fair value.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Accounting for long-lived assets The Company periodically reviews the carrying amount of its property, equipment and leasehold improvements to determine if circumstances exist indicating an impairment or if depreciation periods should be modified. If facts or circumstances indicate that an impairment may exist, the Company will prepare a projection of the undiscounted future cash flows of the specific assets to determine if the assets are recoverable. If impairment exists based on these projections, an adjustment will be made to reduce the carrying amount of the specific assets to fair value.
Revenue [Policy Text Block]	Revenue recognition The Company recognizes revenue for its internal and outsourced manufacturing operations in accordance with ASC 606, Revenue from Contracts with Customers. The Company manufactures custom parts to specific customer orders that have no alternative use to the Company, and the Company believes there is a legally enforceable right to payment for performance completed to date on internally and outsourced manufactured parts. For manufactured parts that meet these two criteria, the Company will recognize revenue over time. Revenue is recognized over time using the input method based on time in production as a percentage of total estimated production time to measure progress toward satisfying performance obligations using the estimated total time necessary to complete the parts per the customer's order and an estimate of inventory and production costs incurred to date. The input method requires an analysis of the incurred time in production and an estimate of the total time necessary to complete the total parts per the customer's order. The majority of the Company’s injection molding contracts have multiple performance obligations including one obligation to produce the mold and a second obligation to produce parts. For injection molding contracts with multiple performance obligations, the Company allocates revenue to each performance obligation based on its relative standalone selling price. The Company generally determines standalone selling price based on the price charged to customers.
Lessee, Leases [Policy Text Block]	Leases The Company accounts for leases in accordance with ASC 842, Leases, which requires the balance sheet recognition of lease assets and lease liabilities by lessees for those leases classified as operating and finance leases. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease assets, current operating lease liabilities and long-term operating lease liabilities in the Consolidated Balance Sheets and are recognized based on the present value of lease payments over the lease term at the commencement date. Finance leases are included in finance lease assets, current finance lease liabilities and long-term finance lease liabilities in the Consolidated Balance Sheets and are recognized based on the present value of lease payments over the lease term at commencement date. The majority of the Company’s leases do not provide an implicit rate of return, therefore, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lease agreements that contain non-lease components, with the exception of certain real estate leases, are accounted for as a single lease component. The Company has operating leases for office space, manufacturing facilities and certain company vehicles and equipment and finance leases for certain company equipment. The leases have remaining lease terms of one year to eight years. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. For purposes of calculating operating lease liabilities, lease terms may be deemed to include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. As of December 31, 2021, the operating lease liability does not include any options to extend or terminate leases.
Income Tax, Policy [Policy Text Block]	Income taxes The Company accounts for income taxes in accordance with ASC 740, Income Taxes (ASC 740). Under this method, the Company determines tax assets and liabilities based upon the differences between the financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. The tax consequences of most events recognized in the financial statements are included in determining income taxes currently payable. However, because tax laws and financial accounting standards differ in their recognition and measurement of assets, liabilities and equity, revenues, expenses, gains and losses, differences arise between the amount of taxable income and pretax financial income for a year and between the tax basis of assets or liabilities and their reported amounts in the financial statements. Because the Company assumes that the reported amounts of assets and liabilities will be recovered and settled, respectively, a difference between the tax basis of an asset or liability and its reported amount in the balance sheet will result in a taxable or a deductible amount in some future years when the related liabilities are settled or the reported amounts of the assets are recovered, giving rise to a deferred tax asset or liability. The Company establishes a valuation allowance for any portion of its deferred tax assets that the Company believes may not be recognized. ASC 740 also clarifies the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements by requiring that individual tax positions are recorded only when they meet a more-likely-than-not criterion. The Company recognizes the effect of income tax positions only if sustaining those positions is more likely than not. The Company records penalties and interest related to unrecognized tax benefits in income taxes in the Company’s Consolidated Statements of Income.
Compensation Related Costs, Policy [Policy Text Block]	Stock-based compensation The Company accounts for stock-based compensation in accordance with ASC 718, Compensation—Stock Compensation (ASC 718). Under the fair value recognition provisions of ASC 718, the Company measures stock-based compensation cost at the grant date fair value and recognizes the compensation expense over the requisite service period, which is the vesting period, using a straight-line attribution method. The amount of stock-based compensation expense recognized during a period is based on the portion of the awards that are ultimately expected to vest. The Company accounts for forfeitures as they occur. Ultimately, the total expense recognized over the vesting period will only be for those awards that vest. The Company’s awards are not eligible to vest early in the event of retirement, however, the awards vest early in the event of a change in control. In determining the compensation cost of the options granted, the fair value of options granted has been estimated on the date of grant using the Black-Scholes option-pricing model.
Advertising Cost [Policy Text Block]	Advertising costs Advertising is expensed as incurred and was approximately $11.6 million, $11.5 million and $13.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.
Research and Development Expense, Policy [Policy Text Block]	Research and development Research and development expenses consist primarily of personnel and outside service costs related to the development of new processes and product lines, enhancements of existing product lines, development of software for internal use, maintenance of internally developed software, quality assurance and testing. Costs for internal use software are evaluated by project and capitalized where appropriate under ASC 350-40, Intangibles - Goodwill and Other, Internal-Use Software. Research and development costs were approximately $44.2 million, $36.9 million and $32.7 million for the years ended December 31, 2021, 2020 and 2019, respectively.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign currency translation/transactions The Company translated the balance sheets of its foreign subsidiaries at period-end exchange rates and the income statement at the average exchange rates in effect throughout the period. The Company has recorded the translation adjustment as a separate component of consolidated shareholders’ equity. Foreign currency transaction gains and losses are recognized in the Consolidated Statements of Comprehensive Income.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently adopted accounting pronouncements In December 2019, the Financial Accounting Standards Board issued Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12). ASU 2019-12 attempts to simplify aspects of accounting for franchise taxes and enacted changes in tax laws or rates, and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 is effective for public business entities for fiscal years beginning after December 15, 2020, including interim periods within that fiscal year. The Company adopted ASU 2019-12 on January 1, 2021 and there was no material impact on the Company’s consolidated financial statements.

Note 3 - Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Disaggregation of Revenue [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
United States	$	384,458	$	345,708	$	360,205
Europe		90,399		74,796		82,805
Japan		13,241		13,891		15,718
Total revenue	$	488,098	$	434,395	$	458,728

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
Injection Molding	$	226,117	$	217,992	$	217,415
CNC Machining		166,811		131,587		155,473
3D Printing		72,721		62,502		61,352
Sheet Metal		20,397		18,838		21,000
Other Revenue		2,052		3,476		3,488
Total revenue	$	488,098	$	434,395	$	458,728

Note 4 - Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	*Year Ended December 31,*
(in thousands, except share and per share amounts)	*2021*		*2020*		*2019*

Net Income	$	33,372	$	50,867	$	63,655

Basic - weighted-average shares outstanding:		27,617,627		26,737,425		26,866,985
Effect of dilutive securities:
Employee stock options and other		35,472		158,932		182,438
Diluted - weighted-average shares outstanding:		27,653,099		26,896,357		27,049,423
Net income per share attributable to common shareholders:
Basic	$	1.21	$	1.90	$	2.37
Diluted	$	1.21	$	1.89	$	2.35

Note 5 - Business Combinations (Tables)

12 Months Ended

Dec. 31, 2021

Acquired 3D Hubs [Member]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

(in thousands)
Assets acquired:
Current assets	$	2,497
Intangible assets		30,770
Goodwill		280,925
Other long-term assets		1,139
Total assets acquired		315,331

Liabilities assumed:
Current contingent consideration		7,093
Current liabilities		5,666
Long-term contingent consideration		6,507
Long-term deferred tax liabilities		1,688
Other long-term liabilities		255
Total liabilities assumed		21,209
Net assets acquired	$	294,122

Cash paid	$	133,847
Cash acquired		(6,434	)
Net cash consideration		127,413
Equity portion of purchase price		166,709
Total purchase consideration	$	294,122

Note 6 - Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Goodwill [Table Text Block]

(in thousands)	Dec. 31, 2019		Goodwill acquired during 2020		Dec. 31, 2020		Goodwill acquired during 2021		Foreign currency translation adjustments during 2021			Dec. 31, 2021

United States	$	123,883	$	-	$	123,883	$	151,276	$	-		$	275,159
Europe		4,239		-		4,239		129,649		(9,067	)		124,821
Japan		630		-		630		-		-			630
Total goodwill	$	128,752	$	-	$	128,752	$	280,925	$	(9,067	)	$	400,610

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	*Year Ended December 31, 2021*							*Year Ended December 31, 2020*									*Weighted Average Useful Life*
(in thousands)	*Gross*		*Accumulated Amortization*			*Net*		*Gross*		*Accumulated Amortization*			*Net*		*Useful Life (in years)*		*Remaining (in years)*

Marketing assets	$	930	$	(713	)	$	217	$	930	$	(620	)	$	310		10.0		2.3
Non-compete agreement		842		(363	)		479		270		(238	)		32		2.0 - 5.0		2.9
Software technology		13,229		(5,014	)		8,215		13,229		(3,645	)		9,584		10.0		6.5
Software platform		26,725		(2,262	)		24,463		-		-			-		12.0		11.1
Tradenames		359		(114	)		245		-		-			-		3.0		2.1
Customer relationships		12,252		(7,873	)		4,379		10,070		(5,646	)		4,424		3.0 - 9.0		1.8
Total intangible assets	$	54,337	$	(16,339	)	$	37,998	$	24,499	$	(10,149	)	$	14,350

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(in thousands)	*Estimated Amortization Expense*
2022	$	6,172
2023		5,968
2024		3,790
2025		3,690
2026		3,586
Thereafter		14,792
Total estimated amortization expense	$	37,998

Note 7 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	*December 31, 2021*						*December 31, 2020*
(in thousands)	*Level 1*		*Level 2*		*Level 3*		*Level 1*		*Level 2*		*Level 3*

Financial Assets:
Cash and cash equivalents	$	65,637	$	-	$	-	$	72,225	$	-	$	-
Money market mutual fund		292		-		-		55,378		-		-
Marketable securities		7,602		18,318		-		-		-		-
Total	$	73,531	$	18,318	$	-	$	127,603	$	-	$	-

Note 8 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Debt Securities, Available-for-sale [Table Text Block]

	*December 31, 2021*
(in thousands)	*Amortized Cost*		*Unrealized Gains*		*Unrealized Losses*			*Fair Value*

U.S. government agency securities	$	2,500	$	-	$	(12	)	$	2,488
Corporate debt securities		9,303		-		(44	)		9,259
U.S. municipal securities		12,549		-		(70	)		12,479
Commercial paper		-		-		-			-
Certificates of deposit/time deposits		1,687		7		-			1,694
Total marketable securities	$	26,039	$	7	$	(126	)	$	25,920

Debt Securities, Held-to-maturity [Table Text Block]

	*December 31, 2020*
(in thousands)	*Amortized Cost*		*Unrealized Gains*		*Unrealized Losses*			*Fair Value*

U.S. government agency securities	$	18,500	$	6	$	(10	)	$	18,496
Corporate debt securities		42,048		211		(11	)		42,248
U.S. municipal securities		25,003		83		(2	)		25,084
Commercial paper		2,499		-		-			2,499
Certificates of deposit/time deposits		5,395		93		-			5,488
Total marketable securities	$	93,445	$	393	$	(23	)	$	93,815

Investments Classified by Contractual Maturity Date [Table Text Block]

	*December 31,*
(in thousands)	*2021*

Due in one year or less	$	11,580
Due after one year through five years		14,340
Total marketable securities	$	25,920

Note 9 - Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Table Text Block]

	*December 31,*
(in thousands)	*2021*			*2020*

Land	$	15,009		$	14,028
Buildings and improvements		107,241			77,285
Machinery and equipment		234,900			221,301
Computer hardware and software		81,889			79,207
Leasehold improvements		8,373			7,821
Construction in progress		14,489			33,780
Total		461,901			433,422
Accumulated depreciation and amortization		(181,555	)		(150,756	)
Property and equipment, net	$	280,346		$	282,666

Note 10 - Inventory (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Inventory, Current [Table Text Block]

	*December 31,*
(in thousands)	*2021*			*2020*

Total inventory		13,474			11,122
Allowance for obsolescence		(313	)		(260	)
Inventory, net of allowance	$	13,161		$	10,862

Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*

Stock options and other	$	17,553	$	13,327	$	9,591
Employee stock purchase plan		1,542		1,346		1,190
Total stock-based compensation expense	$	19,095	$	14,673	$	10,781

Cost of revenue	$	2,595	$	2,451	$	2,056
Operating expenses:
Marketing and sales		3,736		3,121		2,632
Research and development		2,833		2,440		1,851
General and administrative		9,931		6,661		4,242
Total stock-based compensation expense	$	19,095	$	14,673	$	10,781

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	*Year Ended December 31,*
	*2021*		*2020*		*2019*

Risk-free interest rate		0.80 - 1.12%		0.50 - 1.47%		2.35 - 2.58%
Expected life (years)		6.25		6.25		6.25
Expected volatility		45.28 - 45.53%		42.40 - 43.83%		42.52 - 42.74%
Expected dividend yield		0%		0%		0%
Weighted average grant date fair value		$128.14		$45.32		$47.84

Share-based Payment Arrangement, Option, Activity [Table Text Block]

				*Weighted-*
				*Average*
	*Stock Options*			*Exercise Price*

Options outstanding at January 1, 2019		252,616		$	64.71
Granted		53,708			105.81
Exercised		(16,079	)		48.67
Cancelled		(13,979	)		89.50
Options outstanding at December 31, 2019		276,266			72.38
Granted		60,065			105.79
Exercised		(68,958	)		57.00
Cancelled		(37,842	)		67.92
Options outstanding at December 31, 2020		229,531			86.46
Granted		57,901			128.14
Exercised		(28,991	)		58.78
Cancelled		(25,057	)		109.31
Options outstanding at December 31, 2021		233,384		$	97.78

Exercisable at December 31, 2021		115,700		$	81.30

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

	Options Outstanding, Vested and Expected to Vest			Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price ($)	Number Exercisable	Weighted Average Exercise Price ($)

$7.76 to $31.43	4,624	0.35	30.58	4,624	30.58
$31.44 to $66.87	50,159	3.58	57.13	45,986	57.02
$66.88 to $96.20	41,586	7.82	89.95	9,570	71.68
$96.21 to $180.46	137,015	7.67	117.31	55,520	107.28

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				*Weighted-*
				*Average*
				*Grant Date*
	*Restricted*			*Fair Value*
	*Stock Awards*			*Per Share*

Restricted stock at January 1, 2019		323,921		$	79.85
Granted		115,471			106.35
Restrictions lapsed		(92,597	)		77.25
Forfeited		(31,822	)		87.58
Restricted stock at December 31, 2019		314,973			89.55
Granted		108,179			111.76
Restrictions lapsed		(101,941	)		84.70
Forfeited		(14,012	)		94.24
Restricted stock at December 31, 2020		307,199			98.87
Granted		205,996			123.61
Restrictions lapsed		(115,908	)		91.26
Forfeited		(53,505	)		128.05
Restricted stock at December 31, 2021		343,782		$	111.79

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

				*Weighted-*
				*Average*
				*Grant Date*
	*Performance*			*Fair Value*
	*Stock Awards*			*Per Share*

Performance stock at January 1, 2019		52,140		$	76.54
Granted		21,434			104.99
Restrictions lapsed		-			-
Performance change		(61,816	)		88.06
Forfeited		(2,375	)		105.37
Performance stock at December 31, 2019		9,383			58.35
Granted		19,956			118.66
Restrictions lapsed		(7,113	)		58.35
Performance change		-			-
Forfeited		(2,270	)		58.35
Performance stock at December 31, 2020		19,956			118.66
Granted		15,078			203.64
Restrictions lapsed		-			-
Performance change		(10,366	)		192.95
Forfeited		(7,829	)		113.91
Performance stock at December 31, 2021		16,839		$	115.56

Schedule of Share-based Payment Award, Awards Other Than Stock Options, Valuation Assumptions [Table Text Block]

	*Year Ended December 31,*
	*2021*	*2020*	*2019*

Risk-free interest rate	0.06 - 0.17%	0.12 - 0.17%	1.59 - 2.35%
Expected life (months)	6.00	6.00	6.00
Expected volatility	53.44 - 65.53%	50.85 - 59.99%	42.63 - 53.57%
Expected dividend yield	0%	0%	0%

Note 14 - Leases (Tables)

12 Months Ended

Dec. 31, 2021

Assets and Liabilities, Lessee [Table Text Block]

	*December 31,*
(in thousands)	*2021*		*2020*
Operating lease assets	$	5,578	$	9,855

Current operating lease liabilities	$	3,298	$	3,272
Long-term operating lease liabilities		2,245		7,586
Total operating lease liabilities	$	5,543	$	10,858


Finance lease assets	$	1,898	$	2,396

Current finance lease liabilities	$	550	$	552
Long-term finance lease liabilities		1,351		1,919
Total finance lease liabilities	$	1,901	$	2,471

Schedule of Lease Expense [Table Text Block]

	*Twelve Months Ended December 31,*
(in thousands)	*2021*		*2020*
Operating lease cost	$	3,391	$	4,191
Finance lease cost:
Amortization of right-of-use assets	$	498	$	143
Interest on lease obligations	$	9	$	2
Variable lease cost		719		989
Total lease cost	$	4,617	$	5,325

	*Twelve Months Ended December 31,*
(in thousands)	*2021*		*2020*
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	10,477	$	4,426
Operating cash flows from finance leases	$	9	$	2
Financing cash flows from finance leases	$	552	$	154

Lease assets obtained in exchange for new operating lease liabilities		5,293		1,506
Lease assets obtained in exchange for new financing lease liabilities		-		2,523

Lessee, Lease Liability, Maturity [Table Text Block]

(in thousands)	*Operating Leases*			*Finance Leases*
Year Ending December 31,
2022	$	2,550		$	561
2023		1,308			1,352
2024		751			-
2025		711			-
2026		344			-
After 2027		-			-
Total future minimum lease payments		5,664			1,913
Less interest		(121	)		(12	)
Present value of lease liabilities	$	5,543		$	1,901

Schedule of Lease Terms and Discount Rates [Table Text Block]

	*December 31,*
	*2021*			*2020*
Weighted Average Remaining Lease Term - operating leases (years)		3.1			4.4
Weighted Average Remaining Lease Term - finance leases (years)		1.5			2.5
Weighted Average Discount Rate - operating leases		1.6	%		2.6	%
Weighted Average Discount Rate - finance leases		0.4	%		0.5	%

Note 15 - Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2021

Comprehensive Income (Loss) [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*

Balance at beginning of period	$	(3,420	)	$	(7,018	)	$	(8,492	)
Foreign currency translation adjustments
Other comprehensive (loss) income before reclassifications		(13,278	)		3,598			1,474
Amounts reclassified from accumulated other comprehensive income (loss)		-			-			-
Net current-period other comprehensive (loss) income		(13,278	)		3,598			1,474
Net unrealized gains (losses) on investments in securities
Other comprehensive (loss) income before reclassifications		(119	)		-			-
Amounts reclassified from accumulated other comprehensive income (loss)		-			-			-
Net current-period other comprehensive (loss) income		(119	)		-			-
Balance at end of period	$	(16,817	)	$	(3,420	)	$	(7,018	)

Note 16 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*		*2019*

Domestic	$	42,449		$	58,551	$	74,841
Foreign		(2,265	)		4,394		6,352
Total	$	40,184		$	62,945	$	81,193

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*

Current:
Federal	$	5,552		$	2,128		$	6,991
State		975			1,136			2,882
Foreign		(64	)		1,241			1,544
Deferred
Federal		(377	)		6,904			5,121
State		(814	)		(431	)		269
Foreign		(1,181	)		210			(809	)
Valuation Allowance		2,721			890			1,540
Total	$	6,812		$	12,078		$	17,538

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	*Year Ended December 31,*
	*2021*			*2020*			*2019*

Federal tax statutory rate		21.0	%		21.0	%		21.0	%
State tax (net of federal benefit)		2.1			2.1			2.1
Share based compensation		(2.3	)		(1.3	)		(0.5	)
Valuation allowance against deferred tax assets		8.9			2.0			1.4
Contingent consideration reduction		(7.0	)		-			-
Research and development credit		(4.0	)		(3.7	)		(2.8	)
Foreign rate differential		(2.2	)		(0.8	)		(0.3	)
Tax reserves		(1.0	)		1.4			1.1
Provision to return difference		(0.7	)		(1.4	)		-
Miscellaneous		2.2			(0.1	)		(0.4	)
Total		17.0	%		19.2	%		21.6	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	*December 31,*
(in thousands)	*2021*			*2020*

Deferred tax assets:
Accrued expenses	$	2,511		$	2,155
Leases		1,830			3,598
Warrants and stock options		4,271			3,356
Intangible assets		-			1,693
Inventories		205			172
Research and development credit		2,126			1,661
Other assets		1,111			129
Net operating loss		14,046			6,647
Less valuation allowance		(13,999	)		(9,138	)
Total deferred tax assets		12,101			10,273
Deferred tax liabilities:
Depreciation		(31,897	)		(32,671	)
Goodwill		(9,872	)		(7,858	)
Intangible assets		(4,394	)		-
Leases		(1,830	)		(3,598	)
Total deferred tax liabilities		(47,993	)		(44,127	)
Net deferred tax liability	$	(35,892	)	$	(33,854	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	*December 31,*
	*2021*			*2020*

Balance at beginning of period	$	4,830		$	4,598
Additions for tax positions of current year		491			324
Additions for tax positions of prior years		781			475
Decrease related to expiration of statutes of limitations		(1,738	)		(567	)
Balance at period end	$	4,364		$	4,830

Note 18 - Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2021

Income from Operations by Geographic Area [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*			*2020*			*2019*
Income from Operations:
United States	$	98,001		$	98,762		$	108,594
Europe		730			11,707			15,077
Corporate Unallocated and Japan		(58,389	)		(50,633	)		(43,815	)
Total income from operations	$	40,342		$	59,836		$	79,856

Long-lived Assets by Geographic Areas [Table Text Block]

	*December 31,*		*December 31,*		*December 31,*
(in thousands)	*2021*		*2020*		*2019*
Long-lived assets:
United States	$	215,701	$	215,721	$	210,171
Europe		59,388		59,388		45,019
Japan		5,257		7,557		8,522
Total long-lived assets	$	280,346	$	282,666	$	263,712

Expenditures for Additions to Long-lived Assets by Geographic Region [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Expenditures for additions to long-lived assets:
United States	$	26,698	$	29,984	$	45,123
Europe		7,378		16,574		14,743
Japan		133		452		2,364
Total expenditures for additions to long-lived assets	$	34,209	$	47,010	$	62,230

Depreciation and Amortization by Geographic Region [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Depreciation and Amortization:
United States	$	31,642	$	25,744	$	24,767
Europe		7,101		5,024		4,746
Japan		1,745		1,826		1,351
Total depreciation and amortization	$	40,488	$	32,594	$	30,864

Operating Segments [Member]

Revenue from External Customers by Geographic Areas [Table Text Block]

	*Year Ended December 31,*
(in thousands)	*2021*		*2020*		*2019*
Revenue:
United States	$	384,458	$	345,708	$	360,205
Europe		90,399		74,796		82,805
Japan		13,241		13,891		15,718
Total revenue	$	488,098	$	434,395	$	458,728

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Computer Software, Net, Ending Balance	$ 49,400
Goodwill, Impairment Loss	0
Advertising Expense	11,600	$ 11,500	$ 13,000
Research and Development Expense, Total	$ 44,241	$ 36,940	$ 32,692
Building [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Finite-Lived Intangible Asset, Useful Life (Year)	2 years
Minimum [Member] \| Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year
Minimum [Member] \| Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Minimum [Member] \| Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Minimum [Member] \| Computer Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Minimum [Member] \| Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years
Finite-Lived Intangible Asset, Useful Life (Year)	12 years
Maximum [Member] \| Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract (Year)	8 years
Maximum [Member] \| Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years
Maximum [Member] \| Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Maximum [Member] \| Computer Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Maximum [Member] \| Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years

Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Revenue	$ 488,098	$ 434,395	$ 458,728
Injection Molding (Protomold) [Member]
Revenue:
Revenue	226,117	217,992	217,415
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	166,811	131,587	155,473
3D Printing (Fineline) [Member]
Revenue:
Revenue	72,721	62,502	61,352
Sheet Metal [Member]
Revenue:
Revenue	20,397	18,838	21,000
Other Products [Member]
Revenue:
Revenue	2,052	3,476	3,488
UNITED STATES
Revenue:
Revenue	384,458	345,708	360,205
Europe [Member]
Revenue:
Revenue	90,399	74,796	82,805
JAPAN
Revenue:
Revenue	$ 13,241	$ 13,891	$ 15,718

Note 4 - Net Income Per Common Share (Details Textual)	12 Months Ended
Note 4 - Net Income Per Common Share (Details Textual)	Dec. 31, 2021 $ / shares
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount (in dollars per share)	$ 113,043

Note 4 - Net Income Per Common Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 33,372	$ 50,867	$ 63,655
Basic - weighted-average shares outstanding: (in shares)	27,617,627	26,737,425	26,866,985
Employee stock options and other (in shares)	35,472	158,932	182,438
Diluted - weighted-average shares outstanding: (in shares)	27,653,099	26,896,357	27,049,423
Basic (in dollars per share)	$ 1.21	$ 1.90	$ 2.37
Diluted (in dollars per share)	$ 1.21	$ 1.89	$ 2.35

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Note 5 - Business Combinations (Details Textual) - USD ($) $ in Thousands		11 Months Ended	12 Months Ended
	Jan. 22, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 127,413	$ (0)	$ (0)
Business Combination, Contingent Consideration, Liability, Total		$ 0	0
Acquired 3D Hubs [Member]
Business Combination, Consideration Transferred, Total	$ 294,100		294,122
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 127,400		127,413
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	863,995
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 166,700		166,709
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	52,800
Payments to Acquire Businesses, Gross			133,847
Business Combination, Contingent Consideration, Liability, Total	$ 13,600
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles			(3,900)
Goodwill, Purchase Accounting Adjustments			5,500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contingent Consideration			3,300
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities			1,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash Paid			$ (300)
Acquired 3D Hubs [Member] \| Cash [Member]
Payments to Acquire Businesses, Gross		$ 25,000
Acquired 3D Hubs [Member] \| Common Stock [Member] \| Maximum [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	143,983
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 27,800

Note 5 - Business Combinations - Allocation of Purchase Price for the Acquisition of Rapid (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 22, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets acquired:
Goodwill		$ 400,610	$ 128,752	$ 128,752
Liabilities assumed:
Net cash consideration		127,413	$ (0)	$ (0)
Acquired 3D Hubs [Member]
Assets acquired:
Current assets		2,497
Intangible assets		30,770
Goodwill		280,925
Other long-term assets		1,139
Total assets acquired		315,331
Liabilities assumed:
Current contingent consideration		7,093
Current liabilities		5,666
Long-term contingent consideration		6,507
Long-term deferred tax liabilities		1,688
Other long-term liabilities		255
Total liabilities assumed		21,209
Net assets acquired		294,122
Payments to Acquire Businesses, Gross		133,847
Cash acquired		(6,434)
Net cash consideration	$ 127,400	127,413
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	166,700	166,709
Total purchase consideration	$ 294,100	$ 294,122

Note 6 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands, € in Millions			12 Months Ended
	Jan. 22, 2021 USD ($)	Jan. 22, 2021 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Goodwill, Acquired During Period			$ 280,925	$ 0
Amortization of Intangible Assets, Total			6,200	3,000	$ 3,500
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Total			900	0	$ 0
Europe [Member]
Goodwill, Acquired During Period			129,649	0
UNITED STATES
Goodwill, Acquired During Period			151,276	$ 0
Acquired 3D Hubs [Member]
Goodwill, Acquired During Period			$ 280,900
Acquired 3D Hubs [Member] \| Europe [Member]
Goodwill, Acquired During Period \| €		€ 106.5
Acquired 3D Hubs [Member] \| UNITED STATES
Goodwill, Acquired During Period	$ 151,300

Note 6 - Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill, balance as of the beginning of the period	$ 128,752	$ 128,752
Goodwill acquired during the period	280,925	0
Goodwill, foreign currency translation adjustment	(9,067)
Goodwill, balance as of the end of the period	400,610	128,752
UNITED STATES
Goodwill, balance as of the beginning of the period	123,883	123,883
Goodwill acquired during the period	151,276	0
Goodwill, foreign currency translation adjustment	0
Goodwill, balance as of the end of the period	275,159	123,883
Europe [Member]
Goodwill, balance as of the beginning of the period	4,239	4,239
Goodwill acquired during the period	129,649	0
Goodwill, foreign currency translation adjustment	(9,067)
Goodwill, balance as of the end of the period	124,821	4,239
JAPAN
Goodwill, balance as of the beginning of the period	630	630
Goodwill acquired during the period	0	0
Goodwill, foreign currency translation adjustment	0
Goodwill, balance as of the end of the period	$ 630	$ 630

Note 6 - Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Gross	$ 54,337	$ 24,499
Accumulated Amortization	(16,339)	(10,149)
Net	37,998	14,350
Accumulated Amortization	$ 16,339	10,149
Minimum [Member]
Useful Life (Year)	2 years
Maximum [Member]
Useful Life (Year)	12 years
Marketing-Related Intangible Assets [Member]
Gross	$ 930	930
Accumulated Amortization	(713)	(620)
Net	$ 217	310
Useful Life (Year)	10 years
Weighted average useful life remaining (Year)	2 years 3 months 18 days
Accumulated Amortization	$ 713	620
Noncompete Agreements [Member]
Gross	842	270
Accumulated Amortization	(363)	(238)
Net	$ 479	32
Weighted average useful life remaining (Year)	2 years 10 months 24 days
Accumulated Amortization	$ 363	238
Noncompete Agreements [Member] \| Minimum [Member]
Useful Life (Year)	2 years
Noncompete Agreements [Member] \| Maximum [Member]
Useful Life (Year)	5 years
Computer Software, Intangible Asset [Member]
Gross	$ 13,229	13,229
Accumulated Amortization	(5,014)	(3,645)
Net	$ 8,215	9,584
Useful Life (Year)	10 years
Weighted average useful life remaining (Year)	6 years 6 months
Accumulated Amortization	$ 5,014	3,645
Software Platform [Member]
Gross	26,725	0
Accumulated Amortization	2,262	0
Net	$ 24,463	0
Useful Life (Year)	12 years
Weighted average useful life remaining (Year)	11 years 1 month 6 days
Accumulated Amortization	$ (2,262)	0
Trade Names [Member]
Gross	359	0
Accumulated Amortization	114	0
Net	$ 245	0
Useful Life (Year)	3 years
Weighted average useful life remaining (Year)	2 years 1 month 6 days
Accumulated Amortization	$ (114)	0
Customer Relationships [Member]
Gross	12,252	10,070
Accumulated Amortization	(7,873)	(5,646)
Net	$ 4,379	4,424
Weighted average useful life remaining (Year)	1 year 9 months 18 days
Accumulated Amortization	$ 7,873	$ 5,646
Customer Relationships [Member] \| Minimum [Member]
Useful Life (Year)	3 years
Customer Relationships [Member] \| Maximum [Member]
Useful Life (Year)	9 years

Note 6 - Goodwill and Other Intangible Assets - Estimated Aggregated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2022	$ 6,172
2023	5,968
2024	3,790
2025	3,690
2026	3,586
Thereafter	14,792
Total estimated amortization expense	$ 37,998	$ 14,350

Note 7 - Fair Value Measurements (Details Textual) $ in Thousands	Dec. 31, 2021 USD ($)
Business Combination, Contingent Consideration, Liability, Total	$ 0

Note 7 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Marketable securities	$ 25,920
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	65,637	$ 72,225
Marketable securities	7,602	0
Total	73,531	127,603
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Cash and cash equivalents	292	55,378
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Marketable securities	18,318	0
Total	18,318	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money Market Funds [Member]
Cash and cash equivalents	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Marketable securities	0	0
Total	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Money Market Funds [Member]
Cash and cash equivalents	$ 0	$ 0

Note 8 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Amortized Cost	$ 26,039
Unrealized Gains	7
Unrealized Losses	(126)
Fair Value	25,920
Bank Time Deposits [Member]
Amortized Cost	1,687
Unrealized Gains	7
Unrealized Losses	0
Fair Value	1,694
US Government Agencies Debt Securities [Member]
Amortized Cost	2,500
Unrealized Gains	0
Unrealized Losses	(12)
Fair Value	2,488
Corporate Debt Securities [Member]
Amortized Cost	9,303
Unrealized Gains	0
Unrealized Losses	(44)
Fair Value	9,259
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	12,549
Unrealized Gains	0
Unrealized Losses	(70)
Fair Value	12,479
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	0
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 0

Note 8 - Marketable Securities - Short-term and Long-term Held-to-Maturity Securities (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Amortized Cost	$ 93,445
Unrealized Gains	393
Unrealized Losses	(23)
Fair Value	93,815
Bank Time Deposits [Member]
Amortized Cost	5,395
Unrealized Gains	93
Unrealized Losses	0
Fair Value	5,488
US Government Agencies Debt Securities [Member]
Amortized Cost	18,500
Unrealized Gains	6
Unrealized Losses	(10)
Fair Value	18,496
Corporate Debt Securities [Member]
Amortized Cost	42,048
Unrealized Gains	211
Unrealized Losses	(11)
Fair Value	42,248
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	25,003
Unrealized Gains	83
Unrealized Losses	(2)
Fair Value	25,084
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	2,499
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 2,499

Note 8 - Marketable Securities - Balance of Held-to-maturity Debt Securities by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Due in one year or less	$ 11,580
Due after one year through five years	14,340
Total marketable securities	$ 25,920

Note 9 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Depreciation, Total	$ 34.3	$ 29.6	$ 27.4

Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Land	$ 15,009	$ 14,028
Buildings and improvements	107,241	77,285
Machinery and equipment	234,900	221,301
Computer hardware and software	81,889	79,207
Leasehold improvements	8,373	7,821
Construction in progress	14,489	33,780
Total	461,901	433,422
Accumulated depreciation and amortization	(181,555)	(150,756)
Property and equipment, net	$ 280,346	$ 282,666	$ 263,712

Note 10 - Inventory - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total inventory	$ 13,474	$ 11,122
Allowance for obsolescence	(313)	(260)
Inventory, net of allowance	$ 13,161	$ 10,862

Note 11 - Financing Obligations (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term Line of Credit, Total	$ 0	$ 0

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Note 12 - Employee Benefit Plans (Details Textual) - 401(k) Retirement Plan [Member] $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
UNITED STATES
Minimum Number Of Employee Working Hours Required To Be Eligible To Participate In 401K Plan	20
Minimum Service Period Of Employees To Avail Benefit Under Defined Contribution Benefit Plan (Month)	3 months
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 3.7	$ 3.3	$ 3.1
Foreign Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.4	$ 0.5	$ 0.3

Note 13 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 3.8	$ 5.4	$ 0.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	6 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 2.1	$ 1.8	$ 1.5
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	15.00%
Employee Stock Purchase Plan, Offering Period (Month)	6 months
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)	67,729	42,235
Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased (in shares)	61.96	85.85
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,058,866
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 4.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 7 months 6 days
Share-based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 26.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 4 months 24 days
Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 9 months 18 days
Percentage of Target Number Capable of Being Earned and Vesting, Lower Limit	0.00%
Percentage of Target Number Capable of Being Earned and Vesting, Upper Limit	150.00%
Long-Term Incentive Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years

Note 13 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allocated share-based compensation expense	$ 19,095	$ 14,673	$ 10,781
Cost of Sales [Member]
Allocated share-based compensation expense	2,595	2,451	2,056
Selling and Marketing Expense [Member]
Allocated share-based compensation expense	3,736	3,121	2,632
Research and Development Expense [Member]
Allocated share-based compensation expense	2,833	2,440	1,851
General and Administrative Expense [Member]
Allocated share-based compensation expense	9,931	6,661	4,242
Stock Options, Restricted Stock, and Other [Member]
Allocated share-based compensation expense	17,553	13,327	9,591
ESPP [Member]
Allocated share-based compensation expense	$ 1,542	$ 1,346	$ 1,190

Note 13 - Stock-based Compensation - Assumptions Used in the Black-Scholes Option Pricing Model (Details) - Share-based Payment Arrangement, Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expected life (Year)	6 years 3 months	6 years 3 months	6 years 3 months
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value (in dollars per share)	$ 128.14	$ 45.32	$ 47.84
Minimum [Member]
Risk-free interest rate	0.80%	0.50%	2.35%
Expected volatility	45.28%	42.40%	42.52%
Maximum [Member]
Risk-free interest rate	1.12%	1.47%	2.58%
Expected volatility	45.53%	43.83%	42.74%

Note 13 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options outstanding (in shares)	229,531	276,266	252,616
Options outstanding, weighted-average exercise price (in dollars per share)	$ 86.46	$ 72.38	$ 64.71
Granted (in shares)	57,901	60,065	53,708
Granted, weighted-average exercise price (in dollars per share)	$ 128.14	$ 105.79	$ 105.81
Exercised (in shares)	(28,991)	(68,958)	(16,079)
Exercised, weighted-average exercise price (in dollars per share)	$ 58.78	$ 57.00	$ 48.67
Cancelled (in shares)	(25,057)	(37,842)	(13,979)
Cancelled, weighted-average exercise price (in dollars per share)	$ 109.31	$ 67.92	$ 89.50
Options outstanding (in shares)	233,384	229,531	276,266
Options outstanding, weighted-average exercise price (in dollars per share)	$ 97.78	$ 86.46	$ 72.38
Options exercisable (in shares)	115,700
Options exercisable, weighted-average exercise price (in dollars per share)	$ 81.30

Note 13 - Stock-based Compensation - Information about Stock Options Outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Options outstanding, vested and expected to vest, number outstanding (in shares)	233,384	229,531	276,266	252,616
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 97.78	$ 86.46	$ 72.38	$ 64.71
Exercise Price Range One [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 7.76
Options outstanding, vested and expected to vest, number outstanding (in shares)	4,624
Range of exercise prices, upper limit (in dollars per share)	$ 31.43
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	4 months 6 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 30.58
Options exercisable, number exercisable (in shares)	4,624
Options exercisable, weighted average exercise price (in dollars per share)	$ 30.58
Exercise Price Range Two [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 31.44
Options outstanding, vested and expected to vest, number outstanding (in shares)	50,159
Range of exercise prices, upper limit (in dollars per share)	$ 66.87
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	3 years 6 months 29 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 57.13
Options exercisable, number exercisable (in shares)	45,986
Options exercisable, weighted average exercise price (in dollars per share)	$ 57.02
Exercise Price Range Three [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 66.88
Options outstanding, vested and expected to vest, number outstanding (in shares)	41,586
Range of exercise prices, upper limit (in dollars per share)	$ 96.20
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	7 years 9 months 25 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 89.95
Options exercisable, number exercisable (in shares)	9,570
Options exercisable, weighted average exercise price (in dollars per share)	$ 71.68
Exercise Price Range Four [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 96.21
Options outstanding, vested and expected to vest, number outstanding (in shares)	137,015
Range of exercise prices, upper limit (in dollars per share)	$ 123.10
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	7 years 8 months 1 day
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 117.31
Options exercisable, number exercisable (in shares)	55,520
Options exercisable, weighted average exercise price (in dollars per share)	$ 107.28

Note 13 - Stock-based Compensation - Restricted Stock Options (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted stock (in shares)	307,199	314,973	323,921
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 98.87	$ 89.55	$ 79.85
Granted (in shares)	205,996	108,179	115,471
Granted, weighted-average grant date fair value (in dollars per share)	$ 123.61	$ 111.76	$ 106.35
Restrictions lapsed (in shares)	(115,908)	(101,941)	(92,597)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)	$ 91.26	$ 84.70	$ 77.25
Forfeited (in shares)	(53,505)	(14,012)	(31,822)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 128.05	$ 94.24	$ 87.58
Restricted stock (in shares)	343,782	307,199	314,973
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 111.79	$ 98.87	$ 89.55

Note 13 - Stock-based Compensation - Performance Stock (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Performance stock (in shares)	19,956	9,383	52,140
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 118.66	$ 58.35	$ 76.54
Granted (in shares)	15,078	19,956	21,434
Granted, weighted-average grant date fair value (in dollars per share)	$ 203.64	$ 118.66	$ 104.99
Restrictions lapsed (in shares)	0	(7,113)	0
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)	$ 0	$ 58.35	$ 0
Performance change (in shares)	(10,366)	0	(61,816)
Performance change, weighted-average grant date fair value (in dollars per share)	$ 192.95	$ 0	$ 88.06
Forfeited (in shares)	(7,829)	(2,270)	(2,375)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 113.91	$ 58.35	$ 105.37
Granted (in shares)	15,078	19,956	21,434
Restrictions lapsed (in shares)	0	(7,113)	0
Performance change, weighted-average grant date fair value (in dollars per share)	$ 192.95	$ 0	$ 88.06
Forfeited (in shares)	(7,829)	(2,270)	(2,375)
Performance stock (in shares)	16,839	19,956	9,383
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 115.56	$ 118.66	$ 58.35

Note 13 - Stock-based Compensation - Assumptions Used in the Valuation of Performance Stock (Details) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expected life (Year)	6 years	6 years	6 years
Expected dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	0.06%	0.12%	1.59%
Expected volatility	53.44%	50.85%	42.63%
Maximum [Member]
Risk-free interest rate	0.17%	0.17%	2.35%
Expected volatility	65.53%	59.99%	53.57%

Note 14 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating lease assets	$ 5,578	$ 9,855
Current operating lease liabilities	3,298	3,272
Long-term operating lease liabilities	2,245	7,586
Total operating lease liabilities	5,543	10,858
Finance lease assets	1,898	2,396
Current finance lease liabilities	550	552
Long-term finance lease liabilities	1,351	1,919
Total finance lease liabilities	$ 1,901	$ 2,471

Note 14 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 3,391	$ 4,191
Amortization of right-of-use assets	498	143
Interest on lease obligations	9	2
Variable lease cost	719	989
Total lease cost	4,617	5,325
Operating cash flows from operating leases	10,477	4,426
Operating cash flows from finance leases	9	2
Financing cash flows from finance leases	552	154	$ (0)
Lease assets obtained in exchange for new operating lease liabilities	5,293	1,506
Lease assets obtained in exchange for new financing lease liabilities	$ 0	$ 2,523

Note 14 - Leases - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2022, operating lease	$ 2,550
2022, finance lease	561
2023, operating lease	1,308
2023, finance lease	1,352
2024, operating lease	751
2024, finance lease	0
2025, operating lease	711
2025, finance lease	0
2026, operating lease	344
2026, finance lease	0
After 2027, operating lease	0
After 2027, finance lease	0
Total future minimum lease payments, operating lease	5,664
Total future minimum lease payments, finance lease	1,913
Less interest, operating lease	(121)
Less interest, finance lease	(12)
Present value of lease liabilities, operating lease	5,543	$ 10,858
Present value of lease liabilities	$ 1,901	$ 2,471

Note 14 - Leases - Weighted Average Remaining Terms and Discount Rates (Details)	Dec. 31, 2021	Dec. 31, 2020
Weighted Average Remaining Lease Term - operating leases (years) (Year)	3 years 1 month 6 days	4 years 4 months 24 days
Weighted Average Remaining Lease Term - finance leases (years) (Year)	1 year 6 months
Weighted Average Discount Rate - operating leases	1.60%	2.60%
Weighted Average Discount Rate - finance leases	0.40%	0.50%

Note 15 - Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at beginning of period	$ 644,356	$ 585,790	$ 541,497
Balance at end of period	828,493	644,356	585,790
AOCI Attributable to Parent [Member]
Balance at beginning of period	(3,420)	(7,018)	(8,492)
Balance at end of period	(16,817)	(3,420)	(7,018)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Other comprehensive (loss) income before reclassifications	(13,278)	3,598	1,474
Net current-period other comprehensive (loss) income	(13,278)	3,598	1,474
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Other comprehensive (loss) income before reclassifications	(119)	0	0
Net current-period other comprehensive (loss) income	$ (119)	$ 0	$ 0

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit), Total	$ 6,812	$ 12,078	$ 17,538
Effective Income Tax Rate Reconciliation, Percent, Total	17.00%	19.20%	21.60%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period	2.20%
Increase (Decrease) in Income Taxes Payable, CARES Act	$ (2,900)
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	0
Undistributed Earnings of Foreign Subsidiaries	2,700
Operating Loss Carryforwards, Total	$ 14,000
Operating Loss Carryforwards, Expiration Period (Year)	10 years
Deferred Tax Assets, Valuation Allowance, Total	$ 13,999	$ 9,138
Unrecognized Tax Benefits, Ending Balance	$ 4,364	$ 4,830	$ 4,598
GERMANY
Operating Loss Carryforwards, Percentage of Taxable Income	60.00%
NETHERLANDS
Operating Loss Carryforwards, Percentage of Taxable Income	50.00%

Note 16 - Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Domestic	$ 42,449	$ 58,551	$ 74,841
Foreign	(2,265)	4,394	6,352
Income before income taxes	$ 40,184	$ 62,945	$ 81,193

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Note 16 - Income Taxes - Significant Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 5,552	$ 2,128	$ 6,991
State	975	1,136	2,882
Foreign	(64)	1,241	1,544
Deferred
Federal	(377)	6,904	5,121
State	(814)	(431)	269
Foreign	(1,181)	210	(809)
Valuation Allowance	2,721	890	1,540
Total	$ 6,812	$ 12,078	$ 17,538

Note 16 - Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal tax statutory rate	21.00%	21.00%	21.00%
State tax (net of federal benefit)	2.10%	2.10%	2.10%
Share based compensation	(2.30%)	(1.30%)	(0.50%)
Valuation allowance against deferred tax assets	8.90%	2.00%	1.40%
Contingent consideration reduction	(7.00%)	0.00%	0.00%
Research and development credit	(4.00%)	(3.70%)	(2.80%)
Foreign rate differential	(2.20%)	(0.80%)	(0.30%)
Tax reserves	(1.00%)	1.40%	1.10%
Provision to return difference	(0.70%)	(1.40%)	0.00%
Miscellaneous	2.20%	(0.10%)	(0.40%)
Total	17.00%	19.20%	21.60%

Note 16 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accrued expenses	$ 2,511	$ 2,155
Leases	1,830	3,598
Warrants and stock options	4,271	3,356
Intangible assets	0	1,693
Inventories	205	172
Research and development credit	2,126	1,661
Other assets	1,111	129
Net operating loss	14,046	6,647
Less valuation allowance	(13,999)	(9,138)
Total deferred tax assets	12,101	10,273
Deferred tax liabilities:
Depreciation	(31,897)	(32,671)
Goodwill	(9,872)	(7,858)
Intangible assets	(4,394)	0
Leases	(1,830)	(3,598)
Total deferred tax liabilities	(47,993)	(44,127)
Net deferred tax liability	$ (35,892)	$ (33,854)

Note 16 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 4,830	$ 4,598
Additions for tax positions of current year	491	324
Additions for tax positions of prior years	781	475
Decrease related to expiration of statutes of limitations	(1,738)	(567)
Balance	$ 4,364	$ 4,830

Note 18 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 488,098	$ 434,395	$ 458,728
Operating Segments [Member]
Revenue	488,098	434,395	458,728
Operating Segments [Member] \| United States Segment [Member]
Revenue	384,458	345,708	360,205
Operating Segments [Member] \| Europe Segment [Member]
Revenue	90,399	74,796	82,805
Operating Segments [Member] \| Japan Segment [Member]
Revenue	$ 13,241	$ 13,891	$ 15,718

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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