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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