Share capital - Stock options plans and changes (Details)	9 Months Ended
	Aug. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - end of period, number of options | shares	11,118,316
Balance - end of period, weighted average exercise price | $ / shares	$ 1.94
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance - beginning of the year, number of options | shares	8,647,500
Balance - beginning of the year, weighted average exercise price | $ / shares	$ 1.90
Number of options, Granted | shares	3,374,150
Weighted average exercise price, Granted | $ / shares	$ 2.00
Number of options, Exercised | shares	(772,000)
Weighted average exercise price, Exercised | $ / shares	$ 1.59
Number of options, Cancelled | shares	(131,334)
Weighted average exercise price, Cancelled | $ / shares	$ 2.41
Balance - end of period, number of options | shares	11,118,316
Balance - end of period, weighted average exercise price | $ / shares	$ 1.94