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Assets Available for Sale (Details Narrative) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets Available For Sale
Assets available for sale		$ 653

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- References

No definition available.

+ Details

Name:	USEG_AssetsAvailableForSaleAbstract
Namespace Prefix:	USEG_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant