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v2.4.1.9

Subsequent Events (Details) (Revolving Credit Facility [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Apr. 15, 2015
--- | --- | ---
Subsequent Event [Line Items] |  |
Borrowing Base | $ 24.5 useg_BorrowingBase |
Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Borrowing Base |  | $ 7.5 useg_BorrowingBase / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Value assigned to a collection of a borrower's assets, used by lenders to determine the initial and/or ongoing loan amount. + References No definition available. + Details
Name: | useg_BorrowingBase
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |