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Note 7 - Patents (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | June 30, 2021 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | (1,071,319 | ) |  | $ | 306,544 |
Total |  | $ | 1,377,863 |  |  | $ | (1,071,319 | ) |  | $ | 306,544 |
|  | December 31, 2020 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | (1,048,614 | ) |  | $ | 329,249 |
Total |  | $ | 1,377,863 |  |  | $ | (1,048,614 | ) |  | $ | 329,249 |

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