Share capital - Narrative (Details) $ in Thousands	3 Months Ended					6 Months Ended
	May 31, 2025 USD ($) shares	Feb. 28, 2025 USD ($)	May 31, 2024 USD ($)	Feb. 29, 2024 USD ($) shares	Feb. 29, 2024 USD ($) $ / shares	May 31, 2025 USD ($) shares	May 31, 2025 USD ($) $ / shares shares	May 31, 2025 $ / shares	Apr. 14, 2025 USD ($)	Nov. 30, 2024 $ / shares shares
Share capital
Shelf registration, aggregate offering amount									$ 50,000
Equity distribution program, aggregate offering amount	$ 25,000
Stock-based compensation	$ (512)	$ (2,258)	$ (509)	$ (1,999)
Non-vested stock options outstanding | shares	12,015,234					12,015,234	12,015,234
Weighted average exercise price options outstanding | $ / shares								$ 1.48
Stock option expense not yet recognized	$ 400					$ 400	$ 400
Exercise of options, Number of shares | shares				0		350,000
Stock options granted, weighted average exercise price | $ / shares							$ 0.82
Reclassification from reserves to share capital	100					$ 100	$ 100
Aggregate intrinsic value, vested options	$ 4,000			$ 0	$ 0	4,000	$ 4,000
Aggregate intrinsic value, options exercised				0		$ 300
Number of shares, conversion | shares						1
Nonvested Options
Share capital
Non-vested stock options outstanding | shares	1,925,004					1,925,004	1,925,004
Weighted average exercise price options outstanding | $ / shares								1.12
RSU and DSU
Share capital
Stock-based compensation				$ 1,600		$ 1,400
Stock options
Share capital
Stock options granted | shares						2,125,000
Weighted-average exercise price | $ / shares							$ 1.52
Non-vested stock options outstanding | shares	12,015,234					12,015,234	12,015,234			13,630,234
Weighted average exercise price options outstanding | $ / shares								$ 1.48		$ 1.77
Exercise of options, Number of shares | shares						350,000
Stock options granted, weighted average exercise price | $ / shares							$ 0.82
Employees, consultants and directors
Share capital
Stock options granted | shares	2,775,000					2,125,000
Weighted-average exercise price | $ / shares					$ 0.59		1.52
Stock options granted, expiration period		5 years		5 years
Vesting period		2 years		2 years
Stock options granted, weighted average fair value | $ / shares					$ 0.2		$ 0.59
Directors, employees and service providers | Stock options
Share capital
Stock-based compensation				$ 400		$ 900