INCOME TAXES (Details) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021
INCOME TAXES (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred Tax Assets, Valuation Allowance	$ 6,967,000	$ 5,904,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,063,000	$ 2,292,000
Domestic Tax Authority [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	17,116,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
INCOME TAXES (Details) [Line Items]
Tax Credit Carryforward, Amount	784,000
California State Income Tax [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	10,805,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
INCOME TAXES (Details) [Line Items]
Tax Credit Carryforward, Amount	$ 395,000