INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($)	12 Months Ended
May 31, 2021	May 31, 2020
Income Tax Rate Reconciliation [Abstract]
Computed "expected" tax benefit	$ 1,560,971	$ 560,656
Change in valuation allowance	(2,292,366)	(1,152,000)
State income taxes, net of federal benefit	217,559	83,202
Research and development tax credits	456,388	131,461
Permanent tax differences and other	(88,051)	179,042
Stock based compensation benefit	144,699	196,839
Foreign taxes of subsidiaries	(12,257)	(6,590)
Income tax expense	$ (13,057)	$ (7,390)

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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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