SUMMARY OF LEASE ACTIVITY (Details) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021
Leases
Amortization of right-of-use assets	$ 946,535	$ 1,012,870
Interest on lease liabilities	127,898	267,729
Operating lease expense	61,881	77,284
Short-term lease expense	1,493,169	1,481,270
Total	2,629,483	2,839,153
Operating cash flows	127,898	267,729
Financing cash flows	1,455,404	1,861,650
Operating cash flows	61,881	77,284
Right-of-use assets obtained in exchange for lease liabilities – financing lease	$ 24,441
Weighted-average remaining lease term (in years) - Financing leases	1 year 3 months 18 days	2 years
Weighted-average remaining lease term (in years) - Operating leases	1 year 7 months 6 days	2 years 1 month 6 days
Weighted-average discount rate - Financing leases	7.30%	7.40%
Weighted-average discount rate - Operating leases	5.40%	5.30%