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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Allocated Share-based Compensation Expense $ 0.6 $ 0.4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1.7  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0.5