Share capital - Stock options plans and changes (Details)	12 Months Ended
	Nov. 30, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - end of period, number of options	12,649,400
Balance - end of period, weighted average exercise price | $ / shares	$ 2.15
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - beginning of the year, number of options	11,225,400
Balance - beginning of the year, weighted average exercise price | $ / shares	$ 2.49
Number of options, Granted	3,230,000
Weighted average exercise price, Granted | $ / shares	$ 0.78
Number of options, Exercised	0
Number of options, Cancelled	(636,000)
Weighted average exercise price, Cancelled | $ / shares	$ 2.55
Number of options, Expired	(1,170,000)
Weighted average exercise price, Expired | $ / shares	$ 1.43
Balance - end of period, number of options	12,649,400
Balance - end of period, weighted average exercise price | $ / shares	$ 2.15