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Segmented and geographic information, and major customers (Statements of Financial Position) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |
Cash and cash equivalents | $ 9,325 | $ 24,055 | $ 1,319
Trade and other receivables | 6,631 | 4,002 |
Inventories | 9,366 | 6,618 |
Prepaid expenses | 869 | 1,385 |
Available-for-sale investment |  | 503 |
Restricted cash | 331 | 151 |
Long-term investments | 4 | 28 |
Property, plant and equipment | 100,301 | 80,548 |
Total assets | 126,827 | 117,290 |
Trade and other payables | 10,393 | 8,727 |
Other long-term liabilities | 564 | 882 |
Credit facilities |  | 7,758 |
Pre-payment facility | 15,000 |  |
Post-employment benefit obligations | 8,618 | 8,116 |
Decommissioning provision | 3,948 | 3,829 |
Deferred tax liabilities (assets) | 246 | 834 |
Total liabilities | 38,769 | 30,146 |
Mexican Operations [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Cash and cash equivalents | 5,963 | 1,875 |
Trade and other receivables | 4,901 | 2,855 |
Inventories | 6,301 | 3,738 |
Prepaid expenses | 346 | 840 |
Available-for-sale investment |  |  |
Restricted cash | 160 |  |
Long-term investments |  |  |
Property, plant and equipment | 59,686 | 42,474 |
Total assets | 77,357 | 51,782 |
Trade and other payables | 5,893 | 4,144 |
Other long-term liabilities |  |  |
Credit facilities |  |  |
Pre-payment facility | 15,000 |  |
Post-employment benefit obligations |  |  |
Decommissioning provision | 1,904 | 1,834 |
Deferred tax liabilities (assets) | 872 | 834 |
Total liabilities | 23,669 | 6,812 |
U.S. Operations [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Cash and cash equivalents | 1,791 | 3,511 |
Trade and other receivables | 1,711 | 1,106 |
Inventories | 3,065 | 2,880 |
Prepaid expenses | 305 | 353 |
Available-for-sale investment |  |  |
Restricted cash | 171 | 151 |
Long-term investments |  |  |
Property, plant and equipment | 40,570 | 38,022 |
Total assets | 47,613 | 46,023 |
Trade and other payables | 2,608 | 2,422 |
Other long-term liabilities | 469 | 448 |
Credit facilities |  |  |
Pre-payment facility |  |  |
Post-employment benefit obligations | 8,618 | 8,116 |
Decommissioning provision | 2,044 | 1,995 |
Deferred tax liabilities (assets) | (626) |  |
Total liabilities | 13,113 | 12,981 |
Corporate and Other [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Cash and cash equivalents | 1,571 | 18,669 |
Trade and other receivables | 19 | 41 |
Inventories |  |  |
Prepaid expenses | 218 | 192 |
Available-for-sale investment |  | 503 |
Restricted cash |  |  |
Long-term investments | 4 | 28 |
Property, plant and equipment | 45 | 52 |
Total assets | 1,857 | 19,485 |
Trade and other payables | 1,892 | 2,161 |
Other long-term liabilities | 95 | 434 |
Credit facilities |  | 7,758 |
Pre-payment facility |  |  |
Post-employment benefit obligations |  |  |
Decommissioning provision |  |  |
Deferred tax liabilities (assets) |  |  |
Total liabilities | $ 1,987 | $ 10,353 |

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