Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2023	Aug. 31, 2022	Nov. 30, 2022	Feb. 11, 2020
The carrying value of equity method investment
Share of loss on equity investment	$ (2,910)	$ (8,925)	$ (5,998)	$ (13,295)
Investment in Ambler Metals	136,867		136,867		$ 142,754
Assets [Abstract]
Total assets	140,577		140,577		145,995
Cash	3,049		3,049		2,573
Liabilities [Abstract]
Total liabilities	(564)		(564)		(567)
Ambler Metals' Net Loss
General and administrative	278	279	1,014	1,014
Professional Fees	139	131	897	568
Foreign exchange (gain) loss	3	(11)	1	(7)
Ambler Metals
Assets [Abstract]
Total assets	102,140		102,140		114,049
Cash	66,866		66,866		80,755
Mineral properties	30,899		30,899		30,899
Liabilities [Abstract]
Total liabilities	(4,200)		(4,200)		(4,335)
Accounts payable and accrued liabilities	(3,707)		(3,707)		(3,664)
Members' equity (total assets less total liabilities)	97,940		97,940		109,714
Ambler Metals' Net Loss
Depreciation	38	32	113	77
Corporate salaries and wages	478	477	1,417	1,437
General and administrative	43	158	389	560
Mineral property expense	5,210	17,120	10,002	24,527
Professional Fees	181	125	397	626
Foreign exchange (gain) loss	(6)	10	(3)	5
Interest and other income	125	72	319	642
Comprehensive loss	5,819	$ 17,850	11,996	$ 26,590
Ambler Metals LLC
The carrying value of equity method investment
Investment in Ambler Metals					$ 142,754
Joint venture, contributed amount	111		111
Share of loss on equity investment			(5,998)
Investment in Ambler Metals	$ 136,867		$ 136,867			$ 176,000