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Recoverable taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Recoverable taxes [Abstract] |
Schedule of Recoverable Taxes |
| December 31,
| 2 0 1 9 |  | 2 0 1 8
Valued Added Tax | $ | 781,082 |  | $ | 2,262,172
Income Tax |  | 185,243 |  |  | 137,408
Other |  | 445 |  |  | 8,294
| $ | 966,770 |  | $ | 2,407,874

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