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Taxes (Details) - Schedule of deferred tax assets and liabilities - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
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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

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