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Segmented and geographic information, and major customers (Statements of Financial Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |  |
Cash and cash equivalents | $ 3,111 | $ 9,325 | $ 8,723 | $ 24,055
Trade and other receivables | 5,646 | 6,631 |  |
Inventories | 8,250 | 9,366 |  |
Prepaid expenses | 1,774 | 869 |  |
Forward contracts | 263 |  |  |
Restricted cash | 709 | 335 |  |
Property, plant and equipment | 106,048 | 100,301 |  |
Total assets | 125,801 | 126,827 |  |
Trade and other payables | 10,410 | 10,393 |  |
Other long-term liabilities | 735 | 564 |  |
Pre-payment facility | 12,230 | 15,000 |  |
Post-employment benefit obligations | 8,631 | 8,618 |  |
Decommissioning provision | 3,850 | 3,948 |  |
Deferred tax liabilities (assets) | 236 | 246 |  |
Total liabilities | 36,092 | 38,769 |  |
Mexican Operations [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Cash and cash equivalents | 2,789 | 5,963 |  |
Trade and other receivables | 4,262 | 4,901 |  |
Inventories | 5,583 | 6,301 |  |
Prepaid expenses | 558 | 346 |  |
Forward contracts | 263 |  |  |
Restricted cash | 168 | 160 |  |
Property, plant and equipment | 63,163 | 59,686 |  |
Total assets | 76,786 | 77,357 |  |
Trade and other payables | 5,684 | 5,893 |  |
Other long-term liabilities |  |  |  |
Pre-payment facility | 12,230 | 15,000 |  |
Post-employment benefit obligations |  |  |  |
Decommissioning provision | 1,956 | 1,904 |  |
Deferred tax liabilities (assets) | 862 | 872 |  |
Total liabilities | 20,732 | 23,669 |  |
U.S. Operations [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Cash and cash equivalents | 31 | 1,791 |  |
Trade and other receivables | 1,345 | 1,711 |  |
Inventories | 2,667 | 3,065 |  |
Prepaid expenses | 920 | 305 |  |
Forward contracts |  |  |  |
Restricted cash | 541 | 171 |  |
Property, plant and equipment | 42,836 | 40,570 |  |
Total assets | 48,340 | 47,613 |  |
Trade and other payables | 3,370 | 2,608 |  |
Other long-term liabilities | 673 | 469 |  |
Pre-payment facility |  |  |  |
Post-employment benefit obligations | 8,631 | 8,618 |  |
Decommissioning provision | 1,894 | 2,044 |  |
Deferred tax liabilities (assets) | (626) | (626) |  |
Total liabilities | 13,942 | 13,113 |  |
Corporate and Other [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Cash and cash equivalents | 291 | 1,571 |  |
Trade and other receivables | 39 | 19 |  |
Inventories |  |  |  |
Prepaid expenses | 296 | 218 |  |
Forward contracts |  |  |  |
Restricted cash |  | 4 |  |
Property, plant and equipment | 49 | 45 |  |
Total assets | 675 | 1,857 |  |
Trade and other payables | 1,356 | 1,892 |  |
Other long-term liabilities | 62 | 95 |  |
Pre-payment facility |  |  |  |
Post-employment benefit obligations |  |  |  |
Decommissioning provision |  |  |  |
Deferred tax liabilities (assets) |  |  |  |
Total liabilities | $ 1,418 | $ 1,987 |  |

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