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Note 17 - Segment Reporting - Revenue to External Customers and Long-lived Assets by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 344,490	$ 298,055	$ 264,106
Operating Segments [Member] | United States Segment [Member]
Revenues	263,086	223,930	208,018
Operating Segments [Member] | Europe Segment [Member]
Revenues	70,154	63,365	47,433
Operating Segments [Member] | Japan Segment [Member]
Revenues	$ 11,250	$ 10,760	$ 8,655

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=prlb_UnitedStatesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=prlb_EuropeSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type: