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Financial instruments (Narrative) (Details)
COP in Millions
3 Months Ended
Feb. 29, 2016
USD ($)
Feb. 29, 2016
CAD
Feb. 29, 2016
COP
Nov. 30, 2015
USD ($)
Accounts receivable $ 31,000     $ 39,000
Deposits and prepaid amounts $ 532,000     $ 707,000
Change in interest rate 1.00%      
Interest rate loss $ 150,000      
Canadian Limit Due to Currency Risk [Member]        
Cash | CAD   CAD 288,000    
Accounts receivable | CAD   23,000    
Deposits and prepaid amounts | CAD   146,000    
Accounts payable | CAD   CAD 340,000    
Change in foreign exchange rate 10.00% 10.00% 10.00%  
Foreign currency net loss $ 8,000      
Colombian Peso Limit Due to Currency Risk [Member]        
Cash | COP     COP 80  
Deposits and prepaid amounts | COP     57  
Accounts payable | COP     COP 24  
Change in foreign exchange rate 10.00% 10.00% 10.00%  
Foreign currency net loss $ 3,000