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Note 13 - Commitments (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense, Net	$ 3.0	$ 3.6	$ 1.4
Asset Acquisitions, Contingent Consideration, Liability	$ 5.0
Asset Acquisitions, Contingent Consideration, Liability, Milestone Period	2 years

X

- Definition

Amount of liability recognized arising from contingent consideration in an asset acquisition.

+ References

No definition available.

+ Details

Name:	prlb_AssetAcquisitionsContingentConsiderationLiability
Namespace Prefix:	prlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The milestone period of liability recognized arising from contingent consideration in an asset acquisition.

+ References

No definition available.

+ Details

Name:	prlb_AssetAcquisitionsContingentConsiderationLiabilityMilestonePeriod
Namespace Prefix:	prlb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration