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Note 12 - Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, 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, 2017 |  |  | 105,556 |  |  | $ | 9.95 |  |  | 7.5 |  | $ | 2,368,677 |
Issued |  |  | - |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | - |  |  |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 105,556 |  |  | $ | 9.95 |  |  | 6.5 |  | $ | 1,419,728 |

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