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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
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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
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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
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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
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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 + Details
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- 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 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Details
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X
- Details
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Period Type: |