Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows used in operating activities:
Net loss	$ (3,266)	$ (316)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	99	65
Accretion of asset retirement obligation	73	69
Loss (gain) on trading securities	8	(25)
Gain on sale of assets	(4)
Stock-based compensation	189	149
Changes in operating assets and liabilities from continuing operations:
Increase in inventories, net	(88)	(331)
Increase in value added tax receivable, net	(878)	(185)
Decrease in prepaid expenses and other assets	123	23
Decrease in other long-term assets	101	54
Increase in accounts payable and other accrued liabilities	1,225	600
Decrease in deferred revenue		(374)
Decrease in other current liabilities	(233)	(96)
Decrease in reclamation liability	(6)
Decrease in other long-term liabilities	(22)	(108)
Net cash used in operating activities	$ (2,679)	$ (475)