INCOME TAXES (Details) - Deferred Tax - USD ($)	May 31, 2022	May 31, 2021
Deferred tax assets:
Accounts receivable, principally due to allowance for doubtful accounts	$ 43,000	$ 200,000
Inventory valuation	237,000	387,000
Compensated absences	120,000	85,000
Net operating loss carryforwards	4,349,000	3,194,000
Tax credit carryforwards	1,096,000	1,055,000
Deferred rent expense/Capitalized leases	20,000	15,000
Stock Options	1,035,000	613,000
Losses of foreign subsidiaries & Other, net	41,000	370,000
Accumulated depreciation and amortization	26,000	(15,000)
Total deferred tax assets	6,967,000	5,904,000
Less valuation allowance	(6,967,000)	(5,904,000)
Net deferred tax asset