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Note 8 - Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance $ 28,030 $ 24,559  
Acquisitions 5,187  
Impairment (925) (1,800) $ 0
Foreign currency 446 84  
Balance $ 27,551 $ 28,030 $ 24,559