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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