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Note H - Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance $ 24,559 $ 22,615  
Acquisitions 5,187 2,428  
Foreign currency 84 (484)  
Balance 28,030 24,559 $ 22,615
Impairment $ (1,800) $ 0 $ 0