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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	$ 24.5useg_BorrowingBase
Subsequent Event [Member]
Subsequent Event [Line Items]
Borrowing Base		$ 7.5useg_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: