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Share capital (Narrative) (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 23, 2015
USD ($)
shares
Apr. 30, 2012
USD ($)
shares
May 31, 2016
USD ($)
$ / shares
shares
May 31, 2016
USD ($)
$ / shares
CAD / shares
shares
May 31, 2015
USD ($)
shares
May 31, 2015
USD ($)
CAD / shares
Nov. 30, 2015
USD ($)
$ / shares
shares
Contributed surplus | $     $ 124,000 $ 124,000     $ 124,000
Common Stock, Shares Authorized        
Stock options granted, weighted average exericse price | (per share)     $ 0.32 $ 0.44   CAD 0.62  
Stock options granted     1,785,000        
Stock options exercised     (100,000)        
Stock options granted, weighted average exercise price | $ / shares     $ 0.38        
Stock-based compensation | $     $ 398,000   $ 371,000    
Non-vested stock options outstanding     6,673,350 6,673,350     5,288,350
Weighted average exercise price options outstanding | $ / shares     $ 0.51 $ 0.51     $ 0.57
Units vested 199,999            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 108,399            
Aggregate intrinsic value, vested options | $     $ 780,000 $ 780,000 0 CAD 0  
Aggregate intrinsic value, options exercised | $     $ 30,000        
Cash paid upon vesting | $ $ 29,000            
Vesting of deferred share units     75,000       232,878
Non-Vested Options [Member]              
Non-vested stock options outstanding     2,382,249 2,382,249      
Weighted average exercise price options outstanding | $ / shares     $ 0.45 $ 0.45      
Number of RSU's [Member]              
Granted 600,000   600,000        
Plan of Arrangement [Member]              
Common stock committed for issuance   6,181,352          
Contributed surplus | $   $ 12,200,000          
Number of DSU's [Member]              
Common stock committed for issuance     20,685 20,685      
Granted     110,760        
Stock-based Compensation [Member]              
Stock-based compensation | $     $ 150,000   30,000    
NovaGold Arrangement Options [Member]              
Stock issued under the Plan of Arrangement   46,578,078          
Non-vested stock options outstanding     324,820 324,820     509,272
Weighted average exercise price options outstanding | $ / shares     $ 4.39 $ 4.39     $ 4.77
Aggregate intrinsic value, vested options | $     $ 0 $ 0 $ 0 CAD 0  
Options expired     169,878        
Approximations [Member] | Non-Vested Options [Member]              
Stock option expense | $     $ 200,000        
Minimum [Member]              
Vesting terms     0 years        
Maximum [Member]              
Vesting terms     2 years        
New Employees [Member]              
Stock options granted     1,785,000   1,620,000    
Stock options granted, weighted average exercise price | $ / shares     $ 0.13        
Directors, Employees and Services Providers [Member]              
Stock-based compensation | $     $ 250,000   $ 340,000