Fixed assets (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Nov. 30, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 4,450	$ 4,250
Accumulated amortization	(3,626)	(3,535)
Assets derecognized note 4(a)	(618)
Net	206	715
Furniture and equipment | British Columbia, Canada
Property, Plant and Equipment [Line Items]
Cost	63	63
Accumulated amortization	(41)	(29)
Net	22	34
Leasehold improvements | British Columbia, Canada
Property, Plant and Equipment [Line Items]
Cost	253	53
Accumulated amortization	(69)	(17)
Net	184	36
Computer hardware and software | British Columbia, Canada
Property, Plant and Equipment [Line Items]
Cost	115	115
Accumulated amortization	(115)	(112)
Net		3
Computer hardware and software | Alaska, USA
Property, Plant and Equipment [Line Items]
Cost	4	4
Accumulated amortization	(4)	(3)
Net		1
Machinery and equipment | Alaska, USA
Property, Plant and Equipment [Line Items]
Cost	3,667	3,667
Accumulated amortization	(3,049)	(3,026)
Assets derecognized note 4(a)	(618)
Net		641
Vehicles | Alaska, USA
Property, Plant and Equipment [Line Items]
Cost	348	348
Accumulated amortization	$ (348)	$ (348)