Plant and equipment (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Nov. 30, 2019
Cost	$ 4,450	$ 4,250
Accumulated amortization	(3,577)	(3,535)
Assets derecognized	(618)
Net	255	715
Furniture and equipment [Member] \| British Columbia, Canada [Member]
Cost	63	63
Accumulated amortization	(33)	(29)
Net	30	34
Leasehold improvements [Member] \| British Columbia, Canada [Member]
Cost	253	53
Accumulated amortization	(30)	(17)
Net	223	36
Machinery and equipment[Member] \| Alaska, USA [Member]
Cost	3,667	3,667
Accumulated amortization	(3,049)	(3,026)
Assets derecognized	(618)
Net		641
Vehicles [Member] \| Alaska, USA [Member]
Cost	348	348
Accumulated amortization	(348)	(348)
Computer hardware and software [Member] \| British Columbia, Canada [Member]
Cost	115	115
Accumulated amortization	(113)	(112)
Net	2	3
Computer hardware and software [Member] \| Alaska, USA [Member]
Cost	4	4
Accumulated amortization	$ (4)	(3)
Net		$ 1

Amount of derecognition property, plant and equipment.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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