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Interest expense (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Interest Expense [Line Items]    
Amortization of deferred financing costs $ 539,000 $ 797,000
Interest on long term debt 8,759,000 7,087,000
Other interest income (175,000) (144,000)
Total interest expense, net 8,584,000 6,943,000
Interest capitalized 634,000 0
Capital lease obligations    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 2,984,000 3,023,000
Credit Facility    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 2,729,000 1,507,000
Convertible debentures    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 2,200,000 1,760,000
Promissory notes    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 202,000 0
Mortgage    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 105,000 0
Amortization of deferred financing costs $ 256,000 $ 344,000