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Revenue Recognition - Schedule of Disaggregated Revenue (Details) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Reversal of an over accrual		$ 22
Negative realized price	negative realized price of $0.95 per Mcfe

X

- Definition

Negative realized price.

+ References

No definition available.

+ Details

Name:	USEG_NegativeRealizedPriceDescription
Namespace Prefix:	USEG_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reversal of an over accrual.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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