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INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($) $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021
Income Tax Rate Reconciliation Abstract
Computed "expected" tax benefit	$ 947	$ 1,561
Increase (reduction) in income taxes resulting from:
Change in valuation allowance	(1,022)	(2,292)
State income taxes, net of federal benefit	300	217
Research and development tax credits	50	456
Permanent tax differences and other	(217)	(88)
Stock based compensation benefit	11	145
Foreign taxes of subsidiaries	(113)	(12)
Income tax expense	$ (24)	$ (13)

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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