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INCOME TAXES (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
May 31, 2022 | May 31, 2021 | May 31, 2020
Valuation allowance | $ (278,000) | $ 2,438,000 | $ (118,000)
Federal |  |  |
Net operating loss carryforward | (61,068,000) | (64,298,000) |
Indefinite tax credit carryforwards | 14,425,000 |  |
Research and development tax credit carryforwards | 2,362,000 | 2,201,000 |
State |  |  |
Net operating loss carryforward | (30,043,000) | (29,812,000) |
Research and development tax credit carryforwards | 6,152,000 | $ 5,955,000 |
Alternative minimum tax credit carryforwards | $ 34,000 |  |

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