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INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($)	12 Months Ended
	May 31, 2018	May 31, 2017
Income Tax Rate Reconciliation [Abstract]
Computed "expected" tax benefit	$ 418,258	$ 317,997
Increase (reduction) in income taxes resulting from:
Change in valuation allowance	(114,000)	(397,000)
State income taxes, net of federal benefit	71,794	30,215
Research and development tax credits	46,602	40,205
Permanent tax differences and other	78,795	8,583
Impact of tax rate changes	(533,249)
Income tax (expense)	$ (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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