Share capital - Stock options plans and changes (Details)	6 Months Ended
	May 31, 2020 $ / shares shares	May 31, 2020 $ / shares shares	May 31, 2019 $ / shares
Weighted average exercise price, Granted	$ 2.93		$ 2.96
Balance - End of Period, Number of stock options | shares	11,118,933	11,118,933
Balance - End of Period, Weighted average exercise price		$ 1.25
Stock option [Member]
Balance - beginning of the year, Number of stock Options | shares	9,205,600	9,205,600
Balance - beginning of the year, Weighted average exercise price		$ 1.05
Number of options, Granted | shares	2,325,000	2,325,000
Weighted average exercise price, Granted		$ 2.13
Number of options, Exercised | shares	(151,667)	(151,667)
Weighted average exercise price, Exercised		$ 0.56
Number of options, Forfeited | shares	(260,000)	(260,000)
Weighted average exercise price, Forfeited		$ 2.15
Balance - End of Period, Number of stock options | shares	11,118,933	11,118,933
Balance - End of Period, Weighted average exercise price		$ 1.25