Plant and equipment (Details) - USD ($) $ in Thousands	May 31, 2019	Nov. 30, 2018
Cost	$ 3,792	$ 3,792
Accumulated amortization	(3,542)	(3,467)
Net	250	325
Furniture and equipment [Member] | British Columbia, Canada [Member]
Cost	63	63
Accumulated amortization	(23)	(17)
Net	40	46
Leasehold improvements [Member] | British Columbia, Canada [Member]
Cost	53	53
Accumulated amortization	(14)	(10)
Net	39	43
Machinery, and equipment[Member] | Alaska, USA [Member]
Cost	3,178	3,178
Accumulated amortization	(3,014)	(2,964)
Net	164	214
Vehicles [Member] | Alaska, USA [Member]
Cost	348	348
Accumulated amortization	(346)	(333)
Net	2	15
Computer hardware and software [Member] | British Columbia, Canada [Member]
Cost	115	115
Accumulated amortization	(111)	(109)
Net	4	6
Computer hardware and software [Member] | Alaska, USA [Member]
Cost	35	35
Accumulated amortization	(34)	(34)
Net	$ 1	$ 1