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Note 7 - Treasury Stock (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 21 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Jul. 02, 2015
Stock Repurchase Program, Authorized Amount         $ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         600,000
Treasury Stock, Shares, Acquired 700   165,633    
Treasury Stock, Value, Acquired, Cost Method $ 399   $ 73,100    
Payments Related to Tax Withholding for Share-based Compensation $ 331      
Shares Paid for Tax Withholding for Share Based Compensation 517        
Treasury Stock, Shares 164,124   164,124 179,676