Share capital - Stock options outstanding (Details)	6 Months Ended
	May 31, 2025 $ / shares shares
Share capital
Number of outstanding options | shares	12,015,234
Weighted average years to expiry	2 years 5 months 15 days
Weighted average exercise price options outstanding	$ 1.48
Number of exercisable options | shares	10,090,230
Weighted average exercise price exercisable	$ 2.15
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	5,513,334
Weighted average years to expiry	3 years
Weighted average exercise price options outstanding	$ 0.69
Number of exercisable options | shares	4,688,331
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	2,080,000
Weighted average years to expiry	4 years 6 months 7 days
Weighted average exercise price options outstanding	$ 1.52
Number of exercisable options | shares	979,999
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	4,421,900
Weighted average years to expiry	9 months 25 days
Weighted average exercise price options outstanding	$ 2.44
Number of exercisable options | shares	4,421,900
Weighted average exercise price exercisable	$ 2.44
Number of unvested options | shares	0