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Note 18 - Segment Reporting - Revenue From Operations by Reportable Segment (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
Operating Segments [Member] | United States Segment [Member] |  |  |
Revenue: |  |  |
Revenue | 350,535 | 263,086 | 223,930
Operating Segments [Member] | Europe Segment [Member] |  |  |
Revenue: |  |  |
Revenue | 80,889 | 70,154 | 63,365
Operating Segments [Member] | Japan Segment [Member] |  |  |
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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