Income Taxes - Deferred (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 94,767,000	$ 104,956,000
Capital loss carryforwards	1,571,000	1,702,000
Reclamation costs	984,000	1,226,000
Stock-based compensation	360,000	790,000
Property, plant and equipment	1,327,000	2,121,000
Other	1,946,000	1,639,000
Deferred tax assets, gross	100,955,000	112,434,000
Less: Valuation allowance	(100,210,000)	(111,250,000)
Total deferred tax assets	745,000	1,184,000
Deferred tax liabilities:
Property, plant and equipment	(497,000)	(1,023,000)
Other	(248,000)	(161,000)
Total deferred tax liabilities	(745,000)	(1,184,000)
Net deferred tax liabilities	$ 0	$ 0