Share capital - Narrative (Details)	3 Months Ended
	Feb. 29, 2024 USD ($) $ / shares shares	Feb. 29, 2024 USD ($) $ / shares $ / shares shares	Feb. 28, 2023 USD ($) shares	Feb. 28, 2023 USD ($) $ / shares	Feb. 29, 2024 $ / shares	Nov. 30, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	1
Non-vested stock options outstanding	14,354,400	14,354,400
Stock-based compensation | $	$ (1,999,000)		$ (2,220,000)
Weighted average exercise price options outstanding | $ / shares	$ 1.79	$ 1.79
Period for recognition of stock compensation expense	22 months
Aggregate intrinsic value, vested options | $	$ 0	$ 0	20,000.00	$ 20,000.00
Aggregate intrinsic value, options exercised | $	$ 0
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	159,766,930	159,766,930				155,925,990
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	2,533,339	2,533,339
Weighted average exercise price options outstanding | $ / shares					$ 0.66
Stock option expense not yet recognized | $	$ 500,000	$ 500,000
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 1,500,000		$ 1,100,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	14,354,400	14,354,400				12,649,400
Weighted average exercise price options outstanding | $ / shares	$ 1.79	$ 1.79				$ 2.15
Exercise of options, Number of shares	0
Stock options granted	2,775,000
Weighted-average exercise price | $ / shares	$ 0.59
Employees, consultants and directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period	5 years		5 years
Stock options granted	2,775,000		3,230,000
Vesting period	2 years
Weighted-average exercise price | $ / shares		$ 0.59		$ 0.78
Stock options granted, weighted average fair value | $ / shares		$ 0.27		$ 0.37
Directors, employees and service providers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 300,000		$ 500,000
Directors, employees and service providers | NovaGold Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	6
Directors, employees and service providers | NovaGold Arrangement | Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	5,144	5,144
Common stock committed for issuance	859	859