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Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- 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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