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Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 445,596	$ 344,490	$ 298,055
Injection Molding (Protomold) [Member]
Revenue:
Revenue	210,523	194,432	175,974
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	153,521	103,739	81,407
3D Printing (Fineline) [Member]
Revenue:
Revenue	53,342	43,329	37,847
Sheet Metal [Member]
Revenue:
Revenue	24,998	1,767
Other Products [Member]
Revenue:
Revenue	3,212	1,223	2,827
UNITED STATES
Revenue:
Revenue	350,535	263,086	223,930
Europe [Member]
Revenue:
Revenue	80,889	70,154	63,365
JAPAN
Revenue:
Revenue	$ 14,172	$ 11,250	$ 10,760

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No definition available.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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