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Financial instruments (Narrative) (Details)
COP in Millions
6 Months Ended
May 31, 2016
USD ($)
May 31, 2016
CAD
May 31, 2016
COP
Nov. 30, 2015
USD ($)
Accounts receivable $ 42,000     $ 39,000
Deposits and prepaid amounts $ 688,000     $ 707,000
Change in interest rate 1.00%      
Interest rate loss $ 130,000.00      
Canadian Limit Due to Currency Risk [Member]        
Cash | CAD   CAD 178,000    
Accounts receivable | CAD   29,000    
Deposits and prepaid amounts | CAD   147,000    
Accounts payable | CAD   CAD 337,000    
Change in foreign exchange rate 10.00% 10.00% 10.00%  
Foreign currency net loss $ 1,000      
Colombian Peso Limit Due to Currency Risk [Member]        
Cash | COP     COP 284  
Deposits and prepaid amounts | COP     102  
Accounts payable | COP     COP 46  
Change in foreign exchange rate 10.00% 10.00% 10.00%  
Foreign currency net loss $ 11,000