Cash Flow Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows (used in) from operating activities:
Net loss	$ (9,228,000)	$ (9,906,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	530,000	369,000
Accretion of asset retirement obligation	297,000	282,000
Loss on trading securities	9,000	47,000
Gain on sale of assets	(2,150,000)	(125,000)
Stock-based compensation	405,000	744,000
Litigation settlement	250,000
Changes in operating assets and liabilities from continuing operations:
Decrease in inventories, net	511,000	232,000
Increase in value added tax receivable, net	(1,670,000)	(209,000)
Decrease in prepaid expenses and other assets	126,000	37,000
Decrease in other long-term assets	223,000	414,000
Increase in accounts payable and other accrued liabilities	1,183,000	198,000
Decrease in deferred revenue		(1,469,000)
Decrease in other current liabilities	(109,000)	(81,000)
(Decrease) increase in reclamation liability	(195,000)	41,000
Decrease in other long-term liabilities	(94,000)	(231,000)
Net cash used in operating activities	$ (9,912,000)	$ (9,657,000)