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Recoverable taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Recoverable taxes [Abstract] |
Schedule of Recoverable Taxes |
| December 31,
| 2 0 1 8 |  | 2 0 1 7
Valued Added Tax | $ | 2,262,172 |  | $ | 2,075,615
Income Tax |  | 137,408 |  |  | 146,333
Other |  | 8,294 |  |  | 8,427
| $ | 2,407,874 |  | $ | 2,230,375

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