Inventories, net (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Inventories, net	$ 1,840,000		$ 284,000
Charge to cost of goods sold	17,000
Rodeo Project
Dore inventory	832,000		0
In-process inventory	516,000		0
Material and supplies	492,000		284,000
Inventories, net	1,840,000		$ 284,000
Charge to cost of goods sold	17,000
Capitalized depreciation and amortization	58,000
Obsolescence allowance	$ 300,000	$ 300,000