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SIGNIFICANT CONCENTRATIONS (Details Narrative) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Oil And Gas Sales [Member] | Operator B [Member]
Concentration Risk [Line Items]
Operator liability & overpayments	$ 2,442	$ 2,710

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Refers to carrying amount of customer liability curent as on balnce sheet date,

+ References

No definition available.

+ Details

Name:	useg_CustomerLiabilityCurent
Namespace Prefix:	useg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

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- Details

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Period Type: