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Taxes (Details) - Schedule of deferred tax assets and liabilities - USD ($)
Mar. 31, 2021
Mar. 31, 2020
Schedule of deferred tax assets and liabilities [Abstract]    
Allowance for doubtful accounts $ 139,048 $ 113,062
Deferred revenue 546,043 219,177
Net operating loss carry-forwards 2,462 465,059
Total deferred tax asset 687,553 797,298
Valuation allowance (48,284) (525,183)
Deferred tax assets, net $ 639,269 $ 272,115