Share capital - Stock options plans and changes (Details) - $ / shares	3 Months Ended
	Feb. 28, 2025	Feb. 29, 2024
Share capital
Number of options, Exercised	(263,333)	0
Weighted average exercise price, Exercised	$ 0.71
Balance - end of period, number of options	14,146,901
Balance - end of period, weighted average exercise price	$ 1.63
Stock options
Share capital
Balance - beginning of the year, number of options	13,630,234
Balance - beginning of the year, weighted average exercise price	$ 1.77
Number of options, Granted	2,125,000
Weighted average exercise price, Granted	$ 1.52
Number of options, Exercised	(263,333)
Weighted average exercise price, Exercised	$ 0.71
Number of options, Expired	(1,345,000)
Weighted average exercise price, Expired	$ 3.02
Balance - end of period, number of options	14,146,901
Balance - end of period, weighted average exercise price	$ 1.63