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Fair Value Measurements (Details Narrative) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Warrant Liability	$ 425	$ 1,200

X

- Definition

Refers to carrying amount of warrant liability as on balance sheet date.

+ References

No definition available.

+ Details

Name:	USEG_WarrantLiability
Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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