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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2017
Goodwill, Ending Balance	$ 128,752	$ 128,504	$ 28,916
Amortization of Intangible Assets, Total	3,200	500	$ 700
Asset Acquisition, Contingent Consideration Arrangement Upon Completion of Milestone		$ 5,000
Asset Acquisitions, Contingent Consideration, Liability, Milestone Period		2 years
Asset Acquisitions, Contingent Consideration, Liability	4,000	$ 0
Computer Software, Intangible Asset [Member]
Finite-lived Intangible Assets Acquired		8,200
Rapid [Member]
Goodwill, Ending Balance		$ 99,836		$ 99,800
Business Combination, Working Capital Adjustment	$ 200

X

- Definition

For contingent consideration arrangements recognized in connection with an asset acquisition, this element represents an estimate of the consideration which may be paid upon completion of certain milestones.

+ References

No definition available.

+ Details

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

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

Amount of purchase price adjustment based on the working capital (current assets minus current liabilities) of the acquired entity which reduces the purchase price if the closing date working capital of the acquired entity is below an agreed amount.

+ References

No definition available.

+ Details

Name:	prlb_BusinessCombinationWorkingCapitalAdjustment
Namespace Prefix:	prlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

+ Details

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

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: