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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

X

- 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

X

- 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

X

- Details

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