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Note 8 - Accounting for Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Note 8 - Accounting for Stock-Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense $ 2.7 $ 2.7 $ 9.3 $ 7.4
Options, Restricted Stock and RSUs [Member]
       
Note 8 - Accounting for Stock-Based Compensation (Details) [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 14.4   14.4  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in Shares)     0.3  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 1.8   1.8  
Cash Settled RSUs [Member]
       
Note 8 - Accounting for Stock-Based Compensation (Details) [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 7.5   $ 7.5  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)     0.2