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INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
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May 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2020 |  | 2019
Licenses |  | $ | 551,397 |  | $ | 510,600
Patents |  |  | 113,382 |  |  | 68,860
Less accumulated amortization- licenses |  |  | (487,989) |  |  | (471,530)
Less accumulated amortization- patents |  |  | (8,135) |  |  | (721)
Intangible assets, net |  | $ | 168,655 |  | $ | 107,209
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2021 |  | $ | 18,112
2022 |  |  | 8,503
2023 |  |  | 6,211
2024 |  |  | 6,136
2025 |  |  | 5,219
Thereafter |  |  | 124,474
Total |  | $ | 168,655

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