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Note 10 - Stock Repurchase Program (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 05, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Stock Repurchase Program, Authorized Amount $ 200,000      
Stock Repurchase Program, Period in Force 2 years      
Treasury Stock, Shares, Acquired   2,150,000    
Payments for Repurchase of Common Stock   $ 64,378 $ 64,378