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Note 6 - Capital Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 14, 2019
Jul. 18, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Apr. 20, 2017
Stock Repurchase Program, Authorized Amount             $ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 145,000   $ 145,000    
Treasury Stock, Shares, Acquired     380,000   2,400,000    
Treasury Stock, Value, Acquired, Cost Method     $ 35,946 $ 50,000 $ 225,680 $ 100,027  
Common Stock, Dividends, Per Share, Declared   $ 0.26 $ 0.26 $ 0.24 $ 0.78 $ 0.72  
Dividends Payable, Date to be Paid   Aug. 16, 2019          
Dividends Payable, Date of Record   Aug. 02, 2019          
Subsequent Event [Member]              
Common Stock, Dividends, Per Share, Declared $ 0.26            
Dividends Payable, Date to be Paid Nov. 22, 2019            
Dividends Payable, Date of Record Nov. 08, 2019