Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Total expense for the period	$ 3,248	$ 4,470
Temrezli Project Turkey [Member]
Total expense for the period	498	407
Total Turkey Projects [Member]
Total expense for the period	498	407
Kingsville Dome Project Texas [Member]
Total expense for the period	779	812
Rosita Project Texas [Member]
Total expense for the period	402	711
Vasquez Project Texas [Member]
Total expense for the period	461	510
Butler Ranch Project Texas [Member]
Total expense for the period	12	443
Other Projects Texas [Member]
Total expense for the period	94	553
Total Texas Projects [Member]
Total expense for the period	1,748	3,029
Crownpoint Project New Mexico [Member]
Total expense for the period	5	5
Churchrock Project New Mexico [Member]
Total expense for the period	20	21
Cebolleta Project New Mexico [Member]
Total expense for the period	138	537
Juan Tafoya Project New Mexico [Member]
Total expense for the period	47	384
Other Projects New Mexico [Member]
Total expense for the period	5	87
Total New Mexico Projects [Member]
Total expense for the period	215	1,034
Columbus Basin Project, Nevada [Member]
Total expense for the period	232
Other Projects, Nevada [Member]
Total expense for the period	31
Total Nevada Projects [Member]
Total expense for the period	263
Sal Rica Project, Utah [Member]
Total expense for the period	524
Total Utah Projects [Member]
Total expense for the period	$ 524