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Note 6 - Assets Held for Sale (Details Textual) $ in Thousands | Jun. 30, 2022 USD ($) ft² | Dec. 31, 2021 USD ($)
--- | --- | ---
Assets Held-for-sale, Not Part of Disposal Group, Total | $ 1,985 | $ 0
Facility in Maple Plain, Minnesota [Member] |  |
Area of Real Estate Property (Square Foot) | ft² | 35,000 |
Assets Held-for-sale, Not Part of Disposal Group, Total | $ 2,000 |

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=126982154&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=prlb_FacilityInMaplePlainMinnesotaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |