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INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($)	12 Months Ended
	May 31, 2019	May 31, 2018
Income Tax Rate Reconciliation [Abstract]
Computed "expected" tax benefit	$ 497,453	$ 418,258
Increase (reduction) in income taxes resulting from:
Change in valuation allowance	(910,000)	(114,000)
State income taxes, net of federal benefit	89,267	71,794
Research and development tax credits	55,908	46,602
Permanent tax differences and other	(256,572)	78,795
Foreign taxes of subsidiaries	(13,437)
Impact of tax rate changes		(533,249)
Income tax expense	$ (24,237)	$ (31,800)

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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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