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Note 18 - Stock Based Compensation (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Nov. 30, 2013
Oct. 31, 2012
Oct. 10, 2012
Share Price         $ 10 $ 10
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 19,440 36,220 50,600      
2013 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total 247,850          
Stock or Unit Option Plan Expense $ 229,569 $ 216,735        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 248,272          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 255 days          
Share Price $ 14.25          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 102,110          
Restricted Stock or Unit Expense $ 231,276 $ 227,646        
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       148,120    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 83,900          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 225,445          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 73 days          
2013 Equity Incentive Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       370,300    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%          
2013 Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years