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Financial instruments (Narrative) (Details)
12 Months Ended
Nov. 30, 2017
USD ($)
Nov. 30, 2017
CAD
Feb. 21, 2017
USD ($)
Nov. 30, 2016
USD ($)
Accounts receivable $ 470,000     $ 47,000
Deposits and prepaid amounts 837,000     724,000
Interest rate loss 100,000      
Investments 2,516,000     $ 7,835,000
Lease commitment $ 5,521,000   $ 1,300,000  
Canadian Limit Due to Currency Risk [Member]        
Cash | CAD   CAD 2,454,000    
Accounts receivable | CAD   513,000    
Deposits and prepaid amounts | CAD   116,000    
Accounts payable | CAD   CAD 1,275,000    
Change in foreign exchange rate 10.00% 10.00%    
Foreign currency net loss $ 356,000      
Change in interest rate 1.00%      
Investments | CAD   CAD 3,242,000