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Note 6 - Capital Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2024 | May 31, 2023 | May 31, 2022
Income Statement [Abstract] |  |  |
Asset Impairment Charges | $ 0 | $ 934,001 | $ 378,241
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Asset Impairment Charges |
Manufacturing Facility [Member] | CALIFORNIA |  |  |
Impairment, Long-Lived Asset, Held-for-Use | $ 0 |  |
Manufacturing Facility [Member] | CANADA |  |  |
Impairment, Long-Lived Asset, Held-for-Use |  | $ 81,500 |
Equipment [Member] |  |  |
Impairment, Long-Lived Asset, Held-for-Use |  | $ 22,500 |

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