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INCOME TAXES (Details) - Income Tax Rate Reconciliation - USD ($) $ in Thousands | 12 Months Ended
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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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