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16. Stock Option Plans (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
16. Stock Option Plans (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0    
Share-based Payment Arrangement, Noncash Expense $ 24,016 $ 30,273  
2016 Stock Option Plan [Member]      
16. Stock Option Plans (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     250,000
Share-based Compensation by Share-based Payment Award, Term     10 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     5 years
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award     exercise price which is not less than the fair market value of the common stock at the date of grant, except to a shareholder owning 10% or more of the outstanding common stock of the Company, as to which the exercise price must be not less than 110% of the fair market value of the common stock at the date of grant. Options, for the most part, are exercisable on a cumulative basis, 20% at or after each of the first, second, and third anniversary of the grant and 40% after the fourth year anniversary.
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 1.56  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 242,500 242,500  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 9,612 $ 38,288  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year