Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Information
Number of reportable segments | segment			2
Revenue	$ 1,692	$ 1,576	$ 3,336	$ 3,039
Costs Applicable to Sales	548	455	1,085	929
Depreciation, depletion and amortization	130	421	318	971
Exploration, El Quevar, Velardena and Administrative Expense	1,891	3,223	3,949	5,967
Pre-tax (gain) loss	35	3,915	1,170	10,202
Total Assets	13,255	15,443	$ 13,255	15,443	$ 14,008
Capital Expenditures		20		20
Velardena properties
Segment Information
Number of reportable segments | segment			1
Revenue	1,692	1,576	$ 3,336	3,039
Costs Applicable to Sales	548	455	1,085	929
Depreciation, depletion and amortization	35	313	126	733
Exploration, El Quevar, Velardena and Administrative Expense	381	779	738	1,589
Pre-tax (gain) loss	(877)	33	(1,651)	244
Total Assets	7,326	7,111	7,326	7,111
Capital Expenditures		19		19
Corporate, Exploration & Other
Segment Information
Depreciation, depletion and amortization	95	108	192	238
Exploration, El Quevar, Velardena and Administrative Expense	1,510	2,444	3,211	4,378
Pre-tax (gain) loss	912	3,882	2,821	9,958
Total Assets	$ 5,929	8,332	$ 5,929	8,332
Capital Expenditures		$ 1		$ 1