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Note 11 - Capital Stock (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares Under Warrants |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value of Vested Warrants |
Outstanding as of December 31, 2019 |  |  | 105,556 |  |  | $ | 9.95 |  |  |  | 5.50 |  |  | $ | 1,170,616 |
Issued |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2020 |  |  | 105,556 |  |  | $ | 9.95 |  |  |  | 5.00 |  |  | $ | 638,614 |

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