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Note 3 - Share Repurchase Program (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended 25 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 02, 2016
May 01, 2014
Treasury Stock, Shares, Acquired 156,092 2,258,929 2,592,095  
Treasury Stock, Value, Acquired, Cost Method $ 635 $ 9,388 $ 10,480  
Share Repurchase Program [Member]        
Treasury Stock, Shares, Acquired 149,904 2,225,437    
Treasury Stock, Value, Acquired, Cost Method $ 603 $ 9,162    
Maximum [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     3,400,000 1,800,000