Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2025	May 31, 2024	Nov. 30, 2024
The carrying value of equity method investment
Investment in Ambler Metals, Beginning			$ 107,497
Share of loss on equity investment	$ (764)	$ (602)	(1,345)	$ (1,395)
Investment in Ambler Metals, Ending	106,152		106,152
Assets [Abstract]
Total assets	130,983		130,983		$ 133,697
Cash and cash equivalents	24,616		24,616		25,834
Liabilities [Abstract]
Total liabilities	(967)		(967)		$ (903)
Operating Income (Loss) [Abstract]
General and administrative	353	319	696	734
Professional fees	612	192	1,059	392
Foreign exchange (gain)/loss		$ (1)	(11)	$ 1
Ambler Metals LLC
The carrying value of equity method investment
Investment in Ambler Metals, Beginning			107,497
Share of loss on equity investment			(1,345)
Investment in Ambler Metals, Ending	$ 106,152		$ 106,152