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INCOME TAXES (Details) - Deferred Tax - USD ($)	May 31, 2019	May 31, 2018
Deferred Tax [Abstract]
Accounts receivable, principally due to allowance for doubtful accounts	$ 18,000	$ 15,000
Inventory valuation	12,000	13,000
Compensated absences	48,000	49,000
Net operating loss carryforwards	1,735,000	923,000
Tax credit carryforwards	467,000	385,000
Deferred rent expense	9,000	5,000
Other	176,000	163,000
Accumulated depreciation and amortization	(6,000)	6,000
Total deferred tax assets	2,459,000	1,559,000
Less valuation allowance	(2,459,000)	(1,549,000)
Net deferred tax asset		$ 10,000

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