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Note 6 - Capital Stock (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 21, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 21, 2016
Oct. 22, 2015
Subsequent Event [Member]              
Common Stock, Dividends, Per Share, Declared $ 0.22            
Stock Repurchase Program, Authorized Amount             $ 500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 351,000,000   $ 351,000,000      
Treasury Stock, Shares, Acquired   0   1,305,000      
Treasury Stock, Value, Acquired       $ 100,000,000      
Common Stock, Quarterly Dividends, Per Share           $ 0.22  
Common Stock, Dividends, Per Share, Declared   $ 0.22 $ 0.21 $ 0.44 $ 0.42