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Note 6 - Share-based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options outstanding, beginning of period (in shares) 2 98 440  
Options outstanding, beginning of period, weighted average exercise price (in dollars per share) $ 20.76 $ 20.40 $ 19.08  
Options outstanding, weighted average remaining contractual term (Year) 18 days 313 days 1 year 244 days
Options outstanding, aggregate intrinsic value $ 0.1 $ 6.3 $ 25.6
Options exercised (in shares) (2) (95) (341)  
Options exercised, weighted average exercise price (in dollars per share) $ 20.76 $ 20.35 $ 18.70  
Options exercised, aggregate intrinsic value $ 5.8 $ 19.9  
Options forfeited (in shares) (1) (1)  
Options forfeited, weighted average exercise price (in dollars per share) $ 24.27 $ 19.08  
Options outstanding, end of period (in shares) 2 98 440
Options outstanding, end of period, weighted average exercise price (in dollars per share) $ 20.76 $ 20.40 $ 19.08
Options exercisable (in shares)      
Options exercisable, weighted average exercise price (in dollars per share)      
Options exercisable, weighted average remaining contractual term (Year)      
Options exercisable, aggregate intrinsic value