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Share capital - Narrative (Details)
3 Months Ended 6 Months Ended
Apr. 25, 2023
USD ($)
$ / shares
shares
May 31, 2023
USD ($)
$ / shares
shares
Feb. 28, 2023
USD ($)
shares
Feb. 28, 2023
$ / shares
May 31, 2022
USD ($)
shares
Feb. 28, 2022
USD ($)
shares
Feb. 28, 2022
$ / shares
May 31, 2023
USD ($)
$ / shares
shares
May 31, 2022
USD ($)
May 31, 2023
$ / shares
Nov. 30, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, conversion               1      
Non-vested stock options outstanding   13,049,400           13,049,400      
Private placement, net proceeds | $               $ 3,115,000      
Stock-based compensation | $   $ (371,000) $ (2,220,000)   $ (503,000) $ (1,865,000)          
Weighted average exercise price options outstanding | $ / shares   $ 2.16           $ 2.16      
Period for recognition of stock compensation expense               19 months      
Aggregate intrinsic value, vested options | $   $ 0     $ 130,000     $ 0 $ 130,000    
Aggregate intrinsic value, options exercised | $               $ 0 50,000.00    
Share capital                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock committed for issuance   155,269,296           155,269,296     146,225,035
Shares issued for private placement, net of share issue cost (Shares) 5,854,545 5,854,545           5,854,545      
Price per common share | $ / shares $ 0.55                    
Private placement, gross proceeds | $ $ 3,200,000                    
Private placement, net proceeds | $ $ 3,100,000                    
Exercise of options, Number of shares         276,961 31,674          
Nonvested Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-vested stock options outstanding   2,131,757           2,131,757      
Weighted average exercise price options outstanding | $ / shares                   $ 1.02  
Stock option expense not yet recognized | $   $ 360,000           $ 360,000      
DSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation | $               $ 1,800,000 1,200,000    
Stock option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-vested stock options outstanding   13,049,400           13,049,400     11,225,400
Weighted average exercise price options outstanding | $ / shares   $ 2.16           $ 2.16     $ 2.49
Exercise of options, Number of shares               0      
Stock options granted               3,230,000      
Weighted-average exercise price | $ / shares               $ 0.78      
Employees, consultants and directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options granted, expiration period     5 years                
Stock options granted   0 3,230,000     1,734,500          
Vesting period     2 years                
Weighted-average exercise price | $ / shares       $ 0.78     $ 2.21        
Stock options granted, weighted average fair value | $ / shares       $ 0.37     $ 0.90        
Directors, employees and service providers                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation | $               $ 600,000 $ 1,200,000    
Directors, employees and service providers | NovaGold Arrangement                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, conversion               6      
Directors, employees and service providers | NovaGold Arrangement | Nonvested Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-vested stock options outstanding   9,293           9,293      
Common stock committed for issuance   1,549           1,549