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Note 6 - Capital Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
May 19, 2017
Apr. 20, 2017
Jan. 25, 2017
Jan. 24, 2017
Mar. 31, 2017
Mar. 31, 2016
Oct. 22, 2015
Stock Repurchase Program, Authorized Amount             $ 500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 71.0    
Treasury Stock, Shares, Acquired         1,328,000    
Treasury Stock, Value, Acquired         $ 129.8    
Common Stock, Dividends, Per Share, Declared     $ 0.23 $ 0.22 $ 0.23 $ 0.22  
Dividends Payable, Date to be Paid     Feb. 24, 2017        
Dividends Payable, Date of Record     Feb. 10, 2017        
Scenario, Forecast [Member]              
Common Stock, Dividends, Per Share, Cash Paid $ 0.23            
Subsequent Event [Member]              
Stock Repurchase Program, Additional Authorized Amount   $ 500.0          
Common Stock, Dividends, Per Share, Declared   $ 0.23          
Dividends Payable, Date to be Paid   May 19, 2017          
Dividends Payable, Date of Record   May 05, 2017