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Federal Income Taxes - Schedule of Components of Future Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 71,882us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 63,539us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Mineral properties | 11,375URRE_DeferredTaxAssetsMineralPropertiesNoncurrent | 14,153URRE_DeferredTaxAssetsMineralPropertiesNoncurrent
Equipment & Furniture | 133us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 127us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Restoration Reserves | 1,360URRE_DeferredTaxAssetsRestorationReservesNoncurrent | 1,303URRE_DeferredTaxAssetsRestorationReservesNoncurrent
Stock-based compensation | 199us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits |
Derivatives |  | 37us-gaap_DeferredTaxAssetsDerivativeInstruments
Deferred tax assets | 84,949us-gaap_DeferredTaxAssetsGrossNoncurrent | 79,159us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance | (82,435)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | (78,544)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Net | 2,514us-gaap_DeferredTaxAssetsNetNoncurrent | 615us-gaap_DeferredTaxAssetsNetNoncurrent
Prepaids and other | 100us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | 50us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Deferred tax liabilities current | 100us-gaap_DeferredTaxLiabilitiesCurrent | 50us-gaap_DeferredTaxLiabilitiesCurrent
Equipment & Furniture | (956)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Derivatives | (1,658)us-gaap_DeferredTaxLiabilitiesDerivatives | (665)us-gaap_DeferredTaxLiabilitiesDerivatives
Deferred tax liabilities noncurrent | (2,614)us-gaap_DeferredTaxLiabilitiesNoncurrent | (665)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred tax liabilities | (2,514)us-gaap_DeferredTaxLiabilities | (615)us-gaap_DeferredTaxLiabilities
Net deferred tax asset (liability) |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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