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Share capital (Narrative) (Details)
12 Months Ended
Nov. 30, 2017
USD ($)
$ / shares
shares
Nov. 30, 2017
USD ($)
$ / shares
CAD / shares
shares
Nov. 30, 2016
USD ($)
$ / shares
shares
Nov. 30, 2016
USD ($)
$ / shares
CAD / shares
shares
Nov. 30, 2015
USD ($)
Nov. 30, 2017
CAD / shares
Stock options granted, weighted average exericse price | CAD / shares   CAD 0.69   CAD 0.43    
Stock-based compensation | $ $ 705,000   $ 615,000   $ 831,000  
Percent of issued and outstanding shares threshold 10.00%          
Aggregate intrinsic value, vested options | $ $ 1,800,000 CAD 1,800,000 600,000 CAD 600,000 0  
Aggregate intrinsic value, options exercised | $ $ 200,000   100,000   0  
Non-Vested Options [Member]            
Non-vested stock options outstanding 993,342 993,342        
Weighted average exercise price options outstanding | CAD / shares           CAD 0.65
Number of RSU's [Member]            
Granted 600,000          
Number of DSU's [Member]            
Common stock committed for issuance 20,685 20,685        
Granted 115,841          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,447 3,447        
Stock-based Compensation [Member]            
Stock-based compensation | $ $ 400,000   $ 300,000   100,000  
NovaGold Arrangement Options [Member]            
Non-vested stock options outstanding 0 0 312,195 312,195    
Weighted average exercise price options outstanding | $ / shares $ 0 CAD 0 $ 4.28 CAD 4.28    
Approximationss [Member]            
Stock-based compensation | $ $ 400,000   $ 400,000   $ 700,000  
Approximationss [Member] | Non-Vested Options [Member]            
Stock option expense | $ $ 50,000          
Director [Member] | Number of DSU's [Member]            
Granted 115,841          
New Employees [Member]            
Stock options granted 1,695,000   1,785,000      
Stock options granted, weighted average exercise price | $ / shares $ 0.22   $ 0.13      
New Directors [Member] | Number of DSU's [Member]            
Granted 600,000