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Note 8 - Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 30,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0
Allocated Share-based Compensation Expense   $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0
Delphax [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0    
Allocated Share-based Compensation Expense $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0