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Note 5 - Stock-Based Compensation (Details Textual) - USD ($)
6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 2,759,463 $ 1,516,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5,214,386  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 917,610