Share capital - Stock options outstanding (Details)	3 Months Ended
	Feb. 28, 2025 $ / shares shares
Share capital
Number of outstanding options | shares	14,146,901
Weighted average years to expiry	2 years 4 months 9 days
Weighted average exercise price options outstanding	$ 1.63
Number of exercisable options | shares	12,221,897
Weighted average exercise price exercisable	$ 1.71
Number of unvested options | shares	1,925,004
$0.59 to $1.00
Share capital
Exercise price lower range limit	$ 0.59
Exercise price upper range limit	$ 1
Number of outstanding options | shares	5,555,001
Weighted average years to expiry	3 years 3 months
Weighted average exercise price options outstanding	$ 0.69
Number of exercisable options | shares	4,729,998
Weighted average exercise price exercisable	$ 0.71
Number of unvested options | shares	825,003
$1.01 to $2.00
Share capital
Exercise price lower range limit	$ 1.01
Exercise price upper range limit	$ 2
Number of outstanding options | shares	2,125,000
Weighted average years to expiry	4 years 9 months 7 days
Weighted average exercise price options outstanding	$ 1.52
Number of exercisable options | shares	1,024,999
Weighted average exercise price exercisable	$ 1.52
Number of unvested options | shares	1,100,001
$2.01 to $3.00
Share capital
Exercise price lower range limit	$ 2.01
Exercise price upper range limit	$ 3
Number of outstanding options | shares	6,466,900
Weighted average years to expiry	9 months 21 days
Weighted average exercise price options outstanding	$ 2.48
Number of exercisable options | shares	6,466,900
Weighted average exercise price exercisable	$ 2.48
Number of unvested options | shares	0