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Note 5 - Stock-based Compensation (Details Textual) - USD ($)
9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 4,263,767 $ 2,003,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 4,966,245  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 914,110