Share capital - Stock options plans and changes (Details)	3 Months Ended
	Feb. 28, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - end of period, number of options | shares	12,242,150
Balance - end of period, weighted average exercise price | $ / shares	$ 2.50
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - beginning of the year, number of options | shares	10,539,324
Balance - beginning of the year, weighted average exercise price | $ / shares	$ 2.54
Number of options, Granted | shares	1,734,500
Weighted average exercise price, Granted | $ / shares	$ 2.21
Number of options, Exercised | shares	(31,674)
Weighted average exercise price, Exercised | $ / shares	$ 0.70
Balance - end of period, number of options | shares	12,242,150
Balance - end of period, weighted average exercise price | $ / shares	$ 2.50