Share capital - Stock units plans and changes (Details)	6 Months Ended
	May 31, 2020 shares
Number of RSU's [Member]
Balance - beginning of the year	212,501
Granted	200,000
Vested/paid	412,501
Number of DSU's [Member]
Balance - beginning of the year	1,137,488
Granted	44,903
Balance - end of period	1,182,391