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Taxes (Details 1) - USD ($)
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]    
Allowance for doubtful accounts $ 113,062 $ 129,742
Deferred revenue 219,177 83,876
Net operating loss carry-forwards 465,059 402,876
Total deferred tax asset 797,298 616,494
Valuation allowance (525,183) (213,028)
Deferred tax assets, net $ 272,115 $ 403,466