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Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Accumulated other comprehensive loss related to marketable securities	$ 981	$ 903

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- Definition

Accumulated other comprehensive loss related to marketable securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration