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Note 11 - Stock-based Compensation - Options Exercised (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Number of options exercised (in shares) 133,600  
Aggregate fair value $ 1,906 $ 6,780
Employee Stock Option [Member]    
Number of options exercised (in shares) 133,600  
Aggregate fair value $ 5,516  
Intrinsic value 3,630  
Amount of cash received 1,886  
Tax benefit recognized $ 1,270