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INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Income Tax Rate Reconciliation [Abstract]
Computed "expected" tax benefit	$ 489,651	$ 497,453
Increase (reduction) in income taxes resulting from:
Change in valuation allowance	(716,000)	(910,000)
State income taxes, net of federal benefit	154,254	89,267
Research and development tax credits	49,770	55,908
Permanent tax differences and other	21,525	(256,572)
Foreign taxes of subsidiaries	(6,590)	(13,437)
Income tax expense	$ (7,390)	$ (24,237)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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