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Financial instruments (Narrative) (Details)
6 Months Ended
May 31, 2017
USD ($)
May 31, 2017
CAD
Feb. 21, 2017
USD ($)
Nov. 30, 2016
USD ($)
Accounts receivable $ 106,000     $ 47,000
Deposits and prepaid amounts $ 1,112,000     724,000
Change in interest rate 1.00%      
Interest rate loss $ 100,000      
Investments 5,765,000     $ 7,835,000
Lease commitment $ 2,482,000   $ 1,300,000  
Canadian Limit Due to Currency Risk [Member]        
Cash | CAD   CAD 1,471,000    
Accounts receivable | CAD   125,000    
Deposits and prepaid amounts | CAD   116,000    
Accounts payable | CAD   CAD 442,000    
Change in foreign exchange rate 10.00% 10.00%    
Foreign currency net loss $ 631,000      
Investments | CAD   CAD 8,106,000