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Accounts Receivable (Tables)
3 Months Ended
Jun. 30, 2020
Receivables [Abstract]  
Schedule of accounts receivable, net
   June 30,   March 31, 
   2020   2020 
Customer purchases  $3,927,986   $3,975,414 
Credit card receivables   270,346    143,851 
Food stamps   25,410    26,407 
Others   1,052    2,518 
Total accounts receivable   4,224,794    4,148,190 
Allowance for bad debt   (844,557)   (742,849)
Accounts receivable, net  $3,380,237   $3,405,341