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Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Beginning balance $ 58,849 [1] $ 60,264
Impact of currency exchange 3,492 (1,415)
Additions, net 3,142  
Ending balance $ 65,483 $ 58,849 [1]
[1] Derived from December 31, 2016 audited financial statements