Document And Entity Information
Expected dividend yield
Note To Financial Statement Details Textual
Significant Accounting Policies
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Note 3 - Revenue
Note 4 - Net Income Per Common Share
Risk-free interest rate
Note 5 - Goodwill and Other Intangible Assets
Note 6 - Fair Value Measurements
Note 7 - Marketable Securities
Note 8 - Property and Equipment
Note 9 - Inventory
prlb_EmployeeStockPurchasePlanWeightedAveragePurchasePriceOfSharesPurchased
Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased (in shares)
The weighted average purchase price of shares purchased through the Employee Stock Purchase Plan.
Note 12 - Stock-based Compensation
prlb_EmployeeStockPurchasePlanOfferingPeriod
Employee Stock Purchase Plan, Offering Period (Month)
The offering period during which employees may purchase stock through the Employee Stock Purchase Plan.
Income Tax Disclosure [Text Block]
Note 13 - Leases
Note 14 - Accumulated Other Comprehensive Loss
Note 15 - Income Taxes
Note 17 - Segment Reporting
Expected volatility
Note 3 - Revenue - Disaggregation of Revenue (Details)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 4 - Net Income Per Common Share - Computation of Basic and Diluted Net Income Per Share (Details)
Note 5 - Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
Note 5 - Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Details)
Expected life (Year)
Note 5 - Goodwill and Other Intangible Assets - Estimated Aggregated Amortization Expense (Details)
us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Note 6 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details)
Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details)
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred, Total
Note 7 - Marketable Securities - Balance of Held-to-maturity Debt Securities by Contractual Maturity (Details)
Note 8 - Property and Equipment - Components of Property and Equipment (Details)
US States and Political Subdivisions Debt Securities [Member]
Note 9 - Inventory - Inventory (Details)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Note 12 - Stock-based Compensation - Stock-based Compensation Expense (Details)
Note 12 - Stock-based Compensation - Assumptions Used in the Black-Scholes Option Pricing Model (Details)
Note 12 - Stock-based Compensation - Stock Option Activity (Details)
Note 12 - Stock-based Compensation - Information about Stock Options Outstanding (Details)
Note 12 - Stock-based Compensation - Restricted Stock Options (Details)
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Note 12 - Stock-based Compensation - Performance Stock (Details)
Note 12 - Stock-based Compensation - Assumptions Used in the Valuation of Performance Stock (Details)
Note 13 - Leases - Balance Sheet Information (Details)
Granted, weighted-average grant date fair value (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Granted, weighted-average grant date fair value (in dollars per share)
Note 13 - Leases - Lease Expense (Details)
Proceeds from maturities of marketable securities
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)
Note 13 - Leases - Maturities of Operating Lease Liabilities (Details)
Forfeited, weighted-average grant date fair value (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Forfeited, weighted-average grant date fair value (in dollars per share)
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Note 13 - Leases - Weighted Average Remaining Terms and Discount Rates (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Restricted stock, weighted-average grant date fair value (in dollars per share)
Restricted stock, weighted-average grant date fair value (in dollars per share)
Note 14 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited (in shares)
Forfeited (in shares)
Note 15 - Income Taxes - Components of Income (Loss) Before Income Taxes (Details)
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Foreign currency translation adjustments
Note 15 - Income Taxes - Significant Components of Provision for Income Taxes (Details)
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Restricted stock (in shares)
Restricted stock (in shares)
Note 15 - Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Details)
Note 15 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details)
US Government Agencies Debt Securities [Member]
Note 15 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details)
Note 17 - Segment Reporting - Revenue From Operations by Reportable Segment (Details)
Granted (in shares)
Granted (in shares)
Corporate Debt Securities [Member]
Note 17 - Segment Reporting - Income From Operations (Details)
Restrictions lapsed (in shares)
Restrictions lapsed (in shares)
Restrictions lapsed (in shares)
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)
Note 17 - Segment Reporting - Long-lived Assets by Geographic Region (Details)
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Note 17 - Segment Reporting - Expenditures for Additions to Long-lived Assets (Details)
Note 17 - Segment Reporting - Depreciation and Amortization (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTax
Net current-period other comprehensive (loss) income
us-gaap_PaymentsToAcquireOtherInvestments
Purchases of other assets and investments
Options exercisable, weighted-average exercise price (in dollars per share)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Other comprehensive (loss) income before reclassifications
Amounts reclassified from accumulated other comprehensive income (loss)
Options exercisable (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Weighted average grant date fair value (in dollars per share)
us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Purchases of marketable securities
Financial Instruments [Domain]
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)
Options outstanding, weighted-average exercise price (in dollars per share)
Options outstanding, weighted-average exercise price (in dollars per share)
Cancelled, weighted-average exercise price (in dollars per share)
Financial Instrument [Axis]
Goodwill and Intangible Assets Disclosure [Text Block]
Schedule of Goodwill [Table Text Block]
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Granted, weighted-average exercise price (in dollars per share)
Exercised, weighted-average exercise price (in dollars per share)
Domestic Plan [Member]
Foreign Plan [Member]
Accrued compensation
Income taxes payable
Retirement Plan Sponsor Location [Axis]
Retirement Plan Sponsor Location [Domain]
us-gaap_AccountsPayableCurrent
Accounts payable
Options outstanding, vested and expected to vest, number outstanding (in shares)
Options outstanding (in shares)
Options outstanding (in shares)
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property, equipment and other capital assets
Expenditures for additions to long-lived assets
Employee stock options and other (in shares)
Schedule of Share-based Payment Award, Awards Other Than Stock Options, Valuation Assumptions [Table Text Block]
Tabular disclosure of the valuation assumptions of share-based payment awards other than stock options.
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
Noncompete Agreements [Member]
Current liabilities
Shares used to compute net income per share:
Marketing-Related Intangible Assets [Member]
Share based compensation
Qualified subsidiary election.
Supplemental cash flow disclosure
us-gaap_Assets
Total assets
Plan Name [Axis]
Plan Name [Domain]
Other Products [Member]
Represents other products.
401(k) Retirement Plan [Member]
A company sponsored 401(k) defined contribution plan.
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Customer Relationships [Member]
Investment [Text Block]
prlb_OperatingLossCarryforwardsPercentageOfTaxableIncome
Operating Loss Carryforwards, Percentage of Taxable Income
Represents the operating loss carryforwards percentage of taxable income limit.
prlb_OperatingLossCarryforwardsExpirationPeriod
Operating Loss Carryforwards, Expiration Period (Year)
The expiration period of operating loss carryforwards.
Legal Matters and Contingencies [Text Block]
Computer Software, Intangible Asset [Member]
Share-based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Award Type [Domain]
Performance change, weighted-average grant date fair value (in dollars per share)
Performance change, weighted-average grant date fair value (in dollars per share)
Represents the weighted average grant date fair value per share in connection to a performance change related to equity instruments other than options.
Performance change (in shares)
Represents the amount of shares related to a performance change related to equity instruments other than option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
Award Type [Axis]
Net income
Net income
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization
Net
Total estimated amortization expense
Gross
Restricted Stock [Member]
Stock Options, Restricted Stock, and Other [Member]
Equity awards of stock options, restricted stock, and equity instruments not otherwise classified.
Performance Shares [Member]
Share-based Payment Arrangement, Option [Member]
Goodwill acquired during the period
prlb_DeferredTaxAssetsRightOfUseLeases
Leases
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from right of use lease assets.
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated depreciation and amortization
Property and equipment, net
Property and equipment, net
Long-lived assets
Goodwill
Goodwill, balance as of the beginning of the period
Goodwill, balance as of the end of the period
Bank Time Deposits [Member]
us-gaap_PropertyPlantAndEquipmentGross
Total
Machinery and equipment
Construction in progress
Leasehold improvements
Land
Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Information pertaining to office space, manufacturing facilities, and certain company vehicles and equipment.
Buildings and improvements
Schedule of Lease Expense [Table Text Block]
Tabular disclosure of lease expenses incurred.
Schedule of Lease Terms and Discount Rates [Table Text Block]
Tabular disclosure of the weighted average remaining lease terms and discount rates.
Investing activities
Amortized Cost
Total marketable securities
Net income per share:
Earnings Per Share [Text Block]
us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Accrued liabilities and other
Income taxes
prlb_PercentageOfTargetNumberCapableOfBeingEarnedAndVestingLowerLimit
Percentage of Target Number Capable of Being Earned and Vesting, Lower Limit
The lower limit percent of 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.
prlb_PercentageOfTargetNumberCapableOfBeingEarnedAndVestingUpperLimit
Percentage of Target Number Capable of Being Earned and Vesting, Upper Limit
The upper limit percent of 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.
Provision for income taxes
Income Tax Expense (Benefit), Total
Total
Accounts payable
us-gaap_OperatingExpenses
Total operating expenses
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
General and administrative
us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
Due in one year or less
Due after one year through five years
Cash and cash equivalents
us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Unrealized Losses
Unrealized Gains
Allocated share-based compensation expense
Money market mutual funds
Lessee, Operating Leases and Financing Leases [Text Block]
The entire disclosure for operating leases of lessee and finance leases of lessee.
Assets and Liabilities, Lessee [Table Text Block]
Tabular disclosure of lessee's assets and liabilities.
Amendment Flag
Other Comprehensive Income (Loss), net of tax
Comprehensive income
Comprehensive income
City Area Code
Use of Estimates, Policy [Policy Text Block]
us-gaap_GainLossOnSaleOfBusiness
Gain on sale of businesses
New Accounting Pronouncements, Policy [Policy Text Block]
Lessee, Lease Liability, Maturity [Table Text Block]
Tabular disclosure of undiscounted cash flows of operating and finance lease liability.
prlb_IncreaseDecreaseInIncomeTaxesPayableCaresAct
Increase (Decrease) in Income Taxes Payable, CARES Act
Represents increase (decrease) in income taxes payable related to CARES Act.
Common stock, shares outstanding (in shares)
Balance (in shares)
Balance (in shares)
Provision to return difference
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to provision to return difference.
Acquired 3D Hubs [Member]
Represents acquired 3D Hubs.
Current Fiscal Year End Date
prlb_DeferredTaxLiabilityCaresAct
Deferred Tax Liability, CARES Act
Represents deferred tax liability related to CARES act.
Variable lease cost
us-gaap_LeaseCost
Total lease cost
JAPAN
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other
Weighted Average Discount Rate - operating leases
Document Fiscal Period Focus
Operating lease cost
Document Fiscal Year Focus
Consolidation, Policy [Policy Text Block]
Lease assets obtained in exchange for new financing lease liabilities
Document Period End Date
Lease assets obtained in exchange for new operating lease liabilities
Weighted Average Remaining Lease Term - operating leases (years) (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Entity Small Business
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
Entity Public Float
Entity Filer Category
Entity Current Reporting Status
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
us-gaap_CapitalizedComputerSoftwareNet
Capitalized Computer Software, Net, Ending Balance
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
Debt Securities, Held-to-maturity [Table Text Block]
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Stock-based compensation expense
Entity Tax Identification Number
Entity Central Index Key
Entity Registrant Name
Entity [Domain]
Legal Entity [Axis]
Entity Address, Address Line One
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets, Total
Entity Address, City or Town
Entity Address, Postal Zip Code
Entity Address, State or Province
Long-Term Incentive Plan 2012 [Member]
Information pertaining to the 2012 Long-Term Incentive Plan.
Entity Common Stock, Shares Outstanding
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchases of Common Stock
us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Repurchases of Common Stock (in shares)
us-gaap_AdvertisingExpense
Advertising Expense
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Local Phone Number
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercised (in shares)
us-gaap_TableTextBlock
Notes Tables
Revaluation of deferred tax liability
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the revaluation of deferred tax liability.
Common shares issued on exercise of options and other
Sheet Metal [Member]
Represents the information pertaining to sheet metal.
Common shares issued on exercise of options and other (in shares)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Granted (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Cancelled (in shares)
Marketing and sales
Fair Value
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and shareholders' equity
UNITED STATES
Research and development
Research and Development Expense, Total
Retained earnings
Accumulated other comprehensive loss
Debt Disclosure [Text Block]
Cash and Cash Equivalents [Axis]
Cash and Cash Equivalents [Domain]
Changes in operating assets and liabilities, net of acquisitions:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_OtherNoncashIncomeExpense
Other
Inventory Disclosure [Text Block]
Subsequent Event [Member]
Long-term operating lease liabilities
Schedule of Inventory, Current [Table Text Block]
Present value of lease liabilities, operating lease
Operating Lease, Liability, Total
Total operating lease liabilities
Subsequent Event Type [Axis]
Current operating lease liabilities
Subsequent Event Type [Domain]
Other intangible assets, net
Current finance lease liabilities
Retirement Benefits [Text Block]
Long-term finance lease liabilities
Subsequent Events [Text Block]
Operating lease assets
Operating Lease, Right-of-Use Asset
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total future minimum lease payments, operating lease
Present value of lease liabilities
Total finance lease liabilities
Financing cash flows from finance leases
Principal repayments of finance lease obligations
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less interest, operating lease
Deferred taxes
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Thereafter
2023, operating lease
2024, operating lease
Finance lease assets
2025, operating lease
After 2025, operating lease
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2022
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2023
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2024
2021, operating lease
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
2025
2022, operating lease
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2021
Foreign Currency Transactions and Translations Policy [Policy Text Block]
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Other long-term assets
Lessee, Leases [Policy Text Block]
Weighted average useful life remaining (Year)
Useful Life (Year)
Finite-Lived Intangible Asset, Useful Life (Year)
Exercise Price Range One [Member]
Exercise price range one [member
Exercise Price Range Two [Member]
Exercise price range two [member]
Exercise Price Range Three [Member]
Exercise price range three [member]
Operating expenses
Exercise Price Range Four [Member]
Exercise price range four [member
Comprehensive Income, Policy [Policy Text Block]
Income Tax, Policy [Policy Text Block]
us-gaap_AssetsFairValueDisclosure
Total
us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Amortization of held-to-maturity securities
Internal Use Software, Policy [Policy Text Block]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
us-gaap_LesseeOperatingLeaseTermOfContract
Lessee, Operating Lease, Term of Contract (Year)
Research and Development Expense, Policy [Policy Text Block]
us-gaap_Depreciation
Depreciation, Total
Depreciation and amortization
Depreciation and amortization
Long-term marketable securities
Injection Molding (Protomold) [Member]
Represents the Injection Molding (Protomold) product.
us-gaap_AssetsCurrent
Total current assets
3D Printing (Fineline) [Member]
Represents the 3D Printing (Fineline) product.
CNC Machining (Firstcut) [Member]
Represents the CNC Machining (Firstcut) product.
Income taxes receivable
Compensation Related Costs, Policy [Policy Text Block]
Advertising Cost [Policy Text Block]
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,776,796 and 26,786,459 shares as of December 31, 2020 and December 31, 2019, respectively
Adjustments to reconcile net income to net cash provided by operating activities:
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Common stock, shares authorized (in shares)
Common stock, shares issued (in shares)
Common stock, par value (in dollars per share)
us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Valuation Allowance, Total
Less valuation allowance
Statistical Measurement [Domain]
Operating cash flows from operating leases
Maximum [Member]
Minimum [Member]
Product and Service [Axis]
Product and Service [Domain]
us-gaap_DeferredTaxAssetsNet
Total deferred tax assets
Statistical Measurement [Axis]
Operating cash flows from finance leases
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2020 and December 31, 2019, respectively
Preferred stock, shares issued (in shares)
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
Cash paid for interest
Cash paid for taxes
Corporate Unallocated and Japan Segment[Member]
Segment for corporate unallocated expenses and Japan.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Other assets
Property, Plant and Equipment Disclosure [Text Block]
Geographical [Axis]
Europe Segment [Member]
Operating segment for Europe
Property, Plant and Equipment [Table Text Block]
Geographical [Domain]
Preferred stock, shares authorized (in shares)
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Europe [Member]
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
United States Segment [Member]
Operating segment for United States.
Inventory
Inventory, net of allowance
Japan Segment [Member]
Operating segment for Japan.
Preferred stock, par value (in dollars per share)
Revenue
us-gaap_InventoryValuationReserves
Allowance for obsolescence
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy and NAV [Domain]
Inventories
Intangible assets
Total inventory
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
Accrued expenses
Cumulative Effect, Period of Adoption [Domain]
Cumulative Effect, Period of Adoption [Axis]
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life (Year)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Operating activities
Revenue [Policy Text Block]
Statement [Line Items]
Allowance for doubtful accounts
Accounts receivable, net of allowance for doubtful accounts of $1,781 and $952 as of December 31, 2020 and December 31, 2019, respectively
Stock-based compensation
Land, Buildings and Improvements [Member]
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Building [Member]
Statements of Operations:
Short-term marketable securities
Additional paid-in capital
AOCI Attributable to Parent [Member]
Shareholders' equity
Property, Plant and Equipment, Policy [Policy Text Block]
Other income, net
Long-Lived Tangible Asset [Axis]
Segment Reporting Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Net operating loss
Current assets
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Inventory, Policy [Policy Text Block]
Effect of exchange rate changes on cash and cash equivalents
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase in cash and cash equivalents
Deferred tax assets:
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
us-gaap_Liabilities
Total liabilities
us-gaap_OperatingIncomeLoss
Income from operations
Income from operations
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
us-gaap_DeferredTaxLiabilities
Net deferred tax liability
Prepaid expenses and other current assets
us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Goodwill
us-gaap_GrossProfit
Gross profit
Income from Operations by Geographic Area [Table Text Block]
Tabular disclosure of income from operations by geographic area.
Cost of revenue
Accounting Standards Update 2014-09 [Member]
Consolidation Items [Domain]
Long-term deferred tax liabilities
Depreciation and Amortization by Geographic Region [Table Text Block]
Tabular disclosure of depreciation and amortization by geographic region.
Expenditures for Additions to Long-lived Assets by Geographic Region [Table Text Block]
Tabular disclosure of expenditures for additions to long-lived assets by geographic region.
us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Leases
Consolidation Items [Axis]
Accounting Standards Update 2016-02 [Member]
Marketable Securities, Policy [Policy Text Block]
Accounting Standards Update [Domain]
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Purchases of shares withheld for tax obligations
us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Depreciation
Accounting Standards Update [Axis]
us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries
Deferred tax liabilities:
us-gaap_UndistributedEarningsOfForeignSubsidiaries
Undistributed Earnings of Foreign Subsidiaries
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchases of common stock
Scenario [Domain]
Forecast [Member]
Transition tax
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to a one time transition tax.
prlb_EffectiveIncomeTaxRateContinuingOperationsIncreaseDecreaseDuringThePeriod
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period
The increase (decrease) during the period in percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
Retained Earnings [Member]
State
State
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Scenario [Axis]
Proceeds from exercises of stock options
Foreign
Foreign
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Additional Paid-in Capital [Member]
Federal
Common Stock [Member]
Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred
Equity Components [Axis]
Equity Component [Domain]
Current:
Office Furniture And Equipment [Member]
Office furniture and equipment [member
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Foreign
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income taxes
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Domestic
prlb_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedChangeInAmount
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Change in Amount
Amount of change in cost not yet recognized for nonvested award under share-based payment arrangement.
us-gaap_LineOfCredit
Long-term Line of Credit, Total
Disclosure of Reclassification Amount [Text Block]
Revenue:
Disaggregation of Revenue [Table Text Block]
us-gaap_RepaymentsOfLongTermDebt
Payments on debt
Equipment [Member]
Revenue from Contract with Customer [Text Block]
Document Annual Report
Accounts Receivable [Policy Text Block]
Computer Equipment [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]
Entity Incorporation, State or Country Code
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Ending Balance
Balance
Balance
General and Administrative Expense [Member]
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
Document Transition Report
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Decrease related to expiration of statutes of limitations
Entity Interactive Data Current
Selling and Marketing Expense [Member]
Additions for tax positions of prior years
Security Exchange Name
Additions for tax positions of current year
Title of 12(b) Security
Computer hardware and software
The gross amount of computer hardware and software as of the balance sheet date.
Cost of Sales [Member]
Research and Development Expense [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Accrued liabilities and other
Segments [Axis]
Segments [Domain]
Diluted (in shares)
Diluted - weighted-average shares outstanding: (in shares)
prlb_MinimumNumberOfEmployeeWorkingHoursRequiredToBeEligibleToParticipateInFourZeroOneKPlan
Minimum Number Of Employee Working Hours Required To Be Eligible To Participate In 401K Plan
Minimum Number of Employee Working Hours Required to be Eligible to Participate in 401(k) Plan
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards, Total
prlb_MinimumServicePeriodOfEmployeesToAvailBenefitUnderDefinedContributionBenefitPlan
Minimum Service Period Of Employees To Avail Benefit Under Defined Contribution Benefit Plan (Month)
Minimum Service Period Of Employees To Avail Benefit Under Defined Contribution Benefit Plan
Statement [Table]
Statement of Financial Position [Abstract]
Diluted (in dollars per share)
Diluted (in dollars per share)
Basic (in shares)
Basic - weighted-average shares outstanding: (in shares)
Miscellaneous
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent, Total
Total
Business Acquisition [Axis]
Basic (in dollars per share)
Basic (in dollars per share)
Business Acquisition, Acquiree [Domain]
Valuation allowance against deferred tax assets
Statement of Cash Flows [Abstract]
ESPP [Member]
ESPP [member
Lease Contractual Term [Domain]
us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High
Statement of Stockholders' Equity [Abstract]
Lease Contractual Term [Axis]
Income Statement [Abstract]
Revenue from External Customers by Geographic Areas [Table Text Block]
Long-lived Assets by Geographic Areas [Table Text Block]
Tax reserves
Interest on lease obligations
us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
us-gaap_FinanceLeaseLiabilityPaymentsDue
Total future minimum lease payments, finance lease
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Amortization of right-of-use assets
Investments Classified by Contractual Maturity Date [Table Text Block]
2025, finance lease
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
After 2025, finance lease
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount
Less interest, finance lease
2021, finance lease
2022, finance lease
2023, finance lease
2024, finance lease
Weighted Average Discount Rate - finance leases
State tax (net of federal benefit)
Foreign rate differential
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Weighted Average Remaining Lease Term - finance leases (years) (Year)
us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Research and development credit
Financing activities
Federal tax statutory rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Other long-term liabilities
Valuation Allowance
Proceeds from sale of businesses
us-gaap_StockholdersEquity
Total shareholders' equity
Balance
Balance
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Cash used for acquisitions, net of cash acquired
Class of Stock [Axis]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_PaymentsToAcquireBusinessesGross
Payments to Acquire Businesses, Gross
Comprehensive Income (Loss) [Table Text Block]
Options exercisable, number exercisable (in shares)
Performance stock (in shares)
Performance stock (in shares)
Operating Segments [Member]
Options exercisable, weighted average exercise price (in dollars per share)
Range of exercise prices, upper limit (in dollars per share)
Exercise Price Range [Axis]
Exercise Price Range [Domain]
Range of exercise prices, lower limit (in dollars per share)