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Note 3 - Revenue - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Revenue	$ 107,745	$ 80,167
Injection Molding (Protomold) [Member]
Revenue:
Revenue	51,343	47,916
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	36,731	21,972
3D Printing (Fineline) [Member]
Revenue:
Revenue	12,325	10,085
Sheet Metal [Member]
Revenue:
Revenue	6,241
Other Products [Member]
Revenue:
Revenue	1,105	194
UNITED STATES
Revenue:
Revenue	84,167	60,176
Europe [Member]
Revenue:
Revenue	19,945	16,999
JAPAN
Revenue:
Revenue	$ 3,633	$ 2,992

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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
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-Name Accounting Standards Codification
-Topic 606
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