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Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Total expense for the period | $ 4,584 | $ 3,248
Temrezli Project, Turkey [Member] |  |
Total expense for the period | 261 | 498
Total Turkey Projects [Member] |  |
Total expense for the period | 261 | 498
Kingsville Dome Project, Texas [Member] |  |
Total expense for the period | 810 | 779
Rosita Project, Texas [Member] |  |
Total expense for the period | 590 | 402
Vasquez Project, Texas [Member] |  |
Total expense for the period | 572 | 461
Butler Ranch Project, Texas [Member] |  |
Total expense for the period | 21 | 12
Other Projects, Texas [Member] |  |
Total expense for the period | 50 | 94
Total Texas Projects [Member] |  |
Total expense for the period | 2,043 | 1,748
Crownpoint Project, New Mexico [Member] |  |
Total expense for the period |  | 5
Churchrock Project, New Mexico [Member] |  |
Total expense for the period |  | 20
Cebolleta Project, New Mexico [Member] |  |
Total expense for the period | 538 | 138
Juan Tafoya Project, New Mexico [Member] |  |
Total expense for the period | 528 | 47
Other Projects New Mexico [Member] |  |
Total expense for the period | 14 | 5
Total New Mexico Projects [Member] |  |
Total expense for the period | 1,080 | 215
Columbus Basin Project, Nevada [Member] |  |
Total expense for the period | 866 | 232
Railroad Valley, Neveda[Member] |  |
Total expense for the period | 238 |
Other Projects, Nevada [Member] |  |
Total expense for the period | 3 | 31
Total Nevada Projects [Member] |  |
Total expense for the period | 1,107 | 263
Sal Rica Project, Utah [Member] |  |
Total expense for the period | 93 | 524
Total Utah Projects [Member] |  |
Total expense for the period | $ 93 | $ 524

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- Definition Exploration expenses (including prospecting) related to the mining industry would be included in operating expenses. Exploration costs include costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of mineral reserves. + References No definition available. + Details
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