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Note 5 - Capital Stock (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Treasury Stock, Shares, Acquired 3,100,000  
Treasury Stock, Value, Acquired, Cost Method $ 249.8  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 201.2  
Preferred Stock, Shares Outstanding 0 0
Exercise or Vesting [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 2,000,000  
Future Issuance [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 6,900,000