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Financial instruments - Additional information (Details)
6 Months Ended
May 31, 2020
USD ($)
May 31, 2020
CAD ($)
May 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Accounts receivable     $ 699,000 $ 264,000
Interest rate loss $ 100,000      
Canadian Limit Due to Currency Risk [Member]        
Cash   $ 87,000    
Accounts receivable   42,000    
Accounts payable   $ 347,000    
Change in foreign exchange rate   10.00% 10.00%  
Foreign exchange (gain) loss $ 16,000      
Change in interest rate 1.00%