Income Taxes - Deferred (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 110,451,000	$ 119,109,000
Capital loss carry forwards	1,702,000	1,702,000
Stock-based compensation	896,000	747,000
Property, plant and equipment	4,624,000	3,287,000
Other	1,755,000	1,662,000
Deferred tax assets, gross	119,428,000	126,507,000
Less: Valuation allowance	(118,580,000)	(125,528,000)
Total deferred tax assets	848,000	979,000
Deferred tax liabilities:
Property, plant and equipment	(703,000)	(778,000)
Other	(164,000)	(201,000)
Total deferred tax liabilities	(867,000)	(979,000)
Net deferred tax asset (liability)	$ (19,000)	$ 0
Corporate tax rate	21.00%	21.00%
Income tax on special mining percentage	7.50%