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LEASES (Details) - Supplemental cash flow information related to leases
6 Months Ended
Nov. 30, 2020
USD ($)
Supplemental cash flow information related to leases [Abstract]  
Operating cash flows from operating leases $ 159,212
Right-of-use assets obtained in exchange for new operating lease liabilities
Weighted average remaining lease term (in years) 5 years 281 days
Weighted average discount rate 6.50%