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Note 5 - Stock Options and Restricted Stock Awards (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense $ 2.7 $ 2.0 $ 9.9 $ 9.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 18.8   $ 18.8  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 255 days