Share capital - Stock units plans and changes (Details)	9 Months Ended
	Aug. 31, 2019 shares
Number of RSU's [Member]
Balance - beginning of the year	400,002
Granted	225,000
Vested/paid	(412,501)
Balance - end of period	212,501
Number of DSU's [Member]
Balance - beginning of the year	1,182,106
Granted	119,139
Vested/paid	(182,132)
Balance - end of period	1,119,113