Annual report pursuant to Section 13 and 15(d)

ACCOUNTS RECEIVABLE (Details)

v3.21.2
ACCOUNTS RECEIVABLE (Details) - USD ($)
12 Months Ended
May 31, 2021
May 31, 2020
Receivables [Abstract]    
Accounts Receivable, after Allowance for Credit Loss, Current $ 684,935 $ 161,409
Accounts Receivable, Credit Loss Expense (Reversal) $ 15,798 108,392
Accounts Receivable, Allowance for Credit Loss, Writeoff   $ 101,512