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Financial instruments - Additional information (Details)
9 Months Ended
Aug. 31, 2019
USD ($)
Aug. 31, 2019
CAD ($)
Aug. 31, 2019
USD ($)
Nov. 30, 2018
USD ($)
Accounts receivable     $ 359,000 $ 23,000
Interest rate loss $ 200,000      
Canadian Limit Due to Currency Risk [Member]        
Cash   $ 205,000    
Accounts receivable   62,000    
Accounts payable   $ 1,283,000    
Change in foreign exchange rate   10.00% 10.00%  
Foreign exchange (gain) loss $ 76,000      
Change in interest rate 1.00%