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Subsequent Events (Details Narrative) $ in Thousands	Jun. 27, 2018 USD ($)
Subsequent Events [Abstract]
Listed securities in market	$ 100,000

X

- Definition

Listed securities in market.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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