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Note 15 - Segment Data - Revenues From External Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Net revenues from unaffiliated customers | $ 26,881 | $ 23,671 | $ 22,954 | $ 22,673 | $ 24,299 | $ 23,843 | $ 24,409 | $ 21,114 | $ 24,812 | $ 19,913 | $ 21,776 | $ 18,158 | $ 96,179 | $ 93,665 | $ 84,659
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 56,998 | 52,989 | 53,094
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,181 | $ 40,676 | $ 31,565

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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