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Other Long-Term Liabilities and Deferred Credits - Schedule of Other Long-Term Liabilities and Deferred Credits (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other long-term liabilities and deferred credits | $ 950 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent |  | $ 1,354 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent |
Royalties Payable [Member] |  |  |  |
Other long-term liabilities and deferred credits | 500 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = URRE_RoyaltiesPayableMember | [1] | 500 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = URRE_RoyaltiesPayableMember | [1]
Crownpoint Property [Member] |  |  |  |
Other long-term liabilities and deferred credits | 450 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = URRE_CrownpointpropertyMember | [1] | 450 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = URRE_CrownpointpropertyMember | [1]
GE Purchase Contract [Member] |  |  |  |
Other long-term liabilities and deferred credits |  | [2] | $ 400 us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = URRE_GEpurchasecontractMember | [2]
[1] | Royalties payble and Crownpoint property liability were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.
[2] | Balance is due on August 1, 2015 and has been reclassified to short-term accrued liabilities as of December 31, 2014.

X
- Definition Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income after one year or beyond the normal operating cycle, if longer and noncurrent obligations not separately disclosed in the balance sheet (other liabilities, noncurrent). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=URRE_CrownpointpropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=URRE_GEpurchasecontractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=URRE_RoyaltiesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |