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Subsequent Events (Details Narrative) - Subsequent Event [Member] $ in Thousands	1 Months Ended
	Oct. 31, 2018 USD ($)
Drilling cost paid	$ 900
Working interest percentage	30.00%

X

- Definition

Drilling cost paid.

+ References

No definition available.

+ Details

Name:	USEG_DrillingCostPaid
Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Working interest percentage.

+ References

No definition available.

+ Details

Name:	USEG_WorkingInterestPercentage
Namespace Prefix:	USEG_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: