Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Information
Number of reportable segments | segment	2
Revenue	$ 1,196	$ 1,932
Mineral Extraction Processing and Marketing Costs	564	597
Depreciation, depletion and amortization	279	274
Exploration, El Quevar, Velardena and Administrative Expense	3,505	2,760
Pre-Tax (Income)/Loss	3,336	2,351
Total Assets	10,235	11,288	$ 13,357
Capital Expenditures	$ 1	25
Velardena properties
Segment Information
Number of reportable segments | segment	1
Revenue	$ 1,196	1,932
Mineral Extraction Processing and Marketing Costs	564	597
Depreciation, depletion and amortization	204	202
Exploration, El Quevar, Velardena and Administrative Expense	657	634
Pre-Tax (Income)/Loss	371	(316)
Total Assets	4,663	5,641
Capital Expenditures	1
Corporate, Exploration & Other
Segment Information
Depreciation, depletion and amortization	75	72
Exploration, El Quevar, Velardena and Administrative Expense	2,848	2,126
Pre-Tax (Income)/Loss	2,965	2,667
Total Assets	$ 5,572	5,647
Capital Expenditures		$ 25