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Note 3 - Revenue - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Injection Molding (Protomold) [Member]
Revenue	51,586	46,792	102,929	94,708
CNC Machining (Firstcut) [Member]
Revenue	37,788	24,180	74,519	46,152
3D Printing (Fineline) [Member]
Revenue	13,248	10,873	25,573	20,958
Sheet Metal [Member]
Revenue	6,309		12,550
Other Products [Member]
Revenue	721	195	1,826	389
UNITED STATES
Revenue	86,354	63,353	170,521	123,529
Europe [Member]
Revenue	20,213	16,131	40,158	33,130
JAPAN
Revenue	$ 3,085	$ 2,556	$ 6,718	$ 5,548

X

- Definition

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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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