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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 05, 2013
Corporate Aircraft and Facilities [Member] |  |
Significant Disposals of Assets [Line Items] |  |
Proceeds from sale of assets | 1,900,000 |
Aircraft Hanger and Facilities [Member] |  |
Significant Disposals of Assets [Line Items] |  |
Proceeds from sale of assets | 767,000 |
Remington Village [Member] |  |
Significant Disposals of Assets [Line Items] |  |
Intended selling price of Remington Village |  | 15,000,000
Due dligence period | 30 days |
Non refundable earnest money |  | 150,000
Expected selling price of asset held for sale, net |  | 14,800,000
Debt to be retired with proceed from sale |  | $ 9,600,000

X
- Definition The expected amount of debt to be retired from the proceeds of the sale. + References No definition available. + Details
Name: | useg_DebtToBeRetiredWithProceedFromSale
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period of time for performing proper due diligence. + References No definition available. + Details
Name: | useg_DueDiligencePeriod
Namespace Prefix: | useg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The expected selling price of asset held for sale, net of selling costs. + References No definition available. + Details
Name: | useg_ExpectedNetSellingPriceOfAssetHeldForSale
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Money put on deposit with a third party as earnest money to be paid to one party if the other party does not complete the contract. + References No definition available. + Details
Name: | useg_NonRefundableEarnestMoney
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The intended selling price of asset held for sale. + References No definition available. + Details
Name: | useg_SellPriceOfAssetHeldForSale
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration