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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 13, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 192,589        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value $ 6.7        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Allocated Share-based Compensation Expense   $ 1.9 $ 1.9 $ 5.2 $ 5.6