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Note 3 - Revenue - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Injection Molding (Protomold) [Member]
Revenue	53,681	49,480	156,610	144,187
CNC Machining (Firstcut) [Member]
Revenue	40,845	27,166	115,364	73,318
3D Printing (Fineline) [Member]
Revenue	13,845	11,102	39,418	32,061
Sheet Metal [Member]
Revenue	6,452		19,002
Other Products [Member]
Revenue	607	357	2,433	746
UNITED STATES
Revenue	90,732	67,490	261,253	191,019
Europe [Member]
Revenue	21,273	18,094	61,431	51,224
JAPAN
Revenue	$ 3,425	$ 2,521	$ 10,143	$ 8,069

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

+ Details

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