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Note 14 - Commitments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total | $ 4,200 | $ 3,000 | $ 3,600
Asset Acquisitions, Contingent Consideration, Liability | $ 4,000 | $ 0 |

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 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://fasb.org/us-gaap/role/ref/legacyRef -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