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INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
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May 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | May 31,
|  | 2022 |  | 2021
Licenses |  | $ | - |  | $ | 182,000
Patents |  |  | 189,000 |  |  | 240,000
Less accumulated amortization-licenses |  |  | - |  |  | (107,000)
Less accumulated amortization-patents |  |  | (19,000) |  |  | (20,000)
Intangible asssets, net |  | $ | 170,000 |  | $ | 295,000
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2023 |  | $ | 13,000
2024 |  |  | 13,000
2025 |  |  | 13,000
2026 |  |  | 13,000
2027 |  |  | 13,000
Thereafter |  |  | 105,000
Total |  | $ | 170,000

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