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Other long term obligations Other long term obligations - Additional disclosures (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Lease Incentive, Payable [Roll Forward]        
Balance, beginning of year CAD 145 CAD 252    
Amortization of deferred lease inducements (107) (107)    
Balance, end of year 145 252 CAD 38 CAD 145
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance, beginning of year 617 562    
Accretion expense 61 55    
Balance, end of year CAD 678 617    
Estimated undiscounted cash flows required to settle obligation     CAD 1,084 CAD 1,084
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation (percent) 9.42%      
Deferred Gain on Sale Leaseback [Roll Forward]        
Balance, beginning of year CAD 780 371    
Addition 2,792 512    
Amortization of deferred gain on sale leaseback (373) (103)    
Balance, end of year CAD 3,199 CAD 780