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Share capital - Stock options plans and changes (Details)
3 Months Ended
Feb. 29, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance - end of period, number of options 14,354,400
Balance - end of period, weighted average exercise price | $ / shares $ 1.79
Stock option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance - beginning of the year, number of options 12,649,400
Balance - beginning of the year, weighted average exercise price | $ / shares $ 2.15
Number of options, Granted 2,775,000
Weighted average exercise price, Granted | $ / shares $ 0.59
Number of options, Exercised 0
Number of options, Expired (1,070,000)
Weighted average exercise price, Expired | $ / shares $ 2.94
Balance - end of period, number of options 14,354,400
Balance - end of period, weighted average exercise price | $ / shares $ 1.79