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Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Total expense for the period | $ 3,502 URRE_MineralPropertyExpenses | $ 5,215 URRE_MineralPropertyExpenses
Kingsville Dome Project [Member] |  |
Total expense for the period | 862 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_KingsvilleDomeprojectMember | 2,378 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_KingsvilleDomeprojectMember
Rosita Project [Member] |  |
Total expense for the period | 817 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_RositaProjectMember | 508 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_RositaProjectMember
Vasquez Project [Member] |  |
Total expense for the period | 518 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_VasquezProjectMember | 120 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_VasquezProjectMember
Alta Mesa Este Exploration Project [Member] |  |
Total expense for the period | 11 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_AltaMesaEsteExplorationProjectMember |
Butler Ranch Exploration Project [Member] |  |
Total expense for the period | 32 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_ButlerRanchExplorationProjectMember |
Sejita Dome Exploration Project [Member] |  |
Total expense for the period |  |
Crownpoint Project [Member] |  |
Total expense for the period | 5 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_CrownpointProjectMember | 268 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_CrownpointProjectMember
Churchrock Project [Member] |  |
Total expense for the period | 109 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_ChurchrockProjectMember | 250 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_ChurchrockProjectMember
Cebolleta Property [Member] |  |
Total expense for the period | 571 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_CebolletaPropertyMember | 585 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_CebolletaPropertyMember
Juan Tafoya Property [Member] |  |
Total expense for the period | 413 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_JuanTafoyaPropertyMember | 474 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_JuanTafoyaPropertyMember
Roca Honda Project [Member] |  |
Total expense for the period | 80 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_RocaHondaProjectMember | 75 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_RocaHondaProjectMember
Nose Rock Project [Member] |  |
Total expense for the period |  |
West Largo Project [Member] |  |
Total expense for the period | 12 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_WestLargoProjectMember | 22 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_WestLargoProjectMember
Other Project [Member] |  |
Total expense for the period | $ 72 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_OtherProjectMember | $ 535 URRE_MineralPropertyExpenses / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_OtherProjectMember

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- Definition Amount of mineral property expenses incurred during the reporting period. + References No definition available. + Details
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