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Note 7 - Patents (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | March 31, 2019 |
|  | Cost |  |  | Impairment |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (955,842 | ) |  | $ | 422,021 |
Total |  | $ | 1,377,863 |  |  | $ | - |  |  |  | (955,842 | ) |  | $ | 422,021 |
|  | December 31, 2018 |
|  | Cost |  |  | Impairment |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (942,590 | ) |  | $ | 435,273 |
Epidural-Apad acquired patents |  |  | 2,639,647 |  |  |  | (1,539,794 | ) |  |  | (1,099,853 | ) |  |  | - |
Total |  | $ | 4,017,510 |  |  | $ | (1,539,794 | ) |  | $ | (2,042,443 | ) |  | $ | 435,273 |

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