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Real Estate Held for Sale - Schedule of Carrying Value and Fair Value of Real Estate Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Real Estate [Abstract]
Estimated sales price of building and land	$ 800	$ 800
Estimated sales price of additional land	275	275
Estimated cost to sell	(100)	(100)
Estimated net proceeds	$ 975	$ 975

X

- Definition

Estimated sales price of additional land.

+ References

No definition available.

+ Details

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

X

- Definition

Estimated cost to sell.

+ References

No definition available.

+ Details

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

X

- Definition

Estimated net proceeds.

+ References

No definition available.

+ Details

Name:	USEG_FairValueOfRealEstateHeldForSaleEstimatedNetProceeds
Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Estimated sales price of building and land.

+ References

No definition available.

+ Details

Name:	USEG_FairValueOfRealEstateHeldForSaleOfBuildingAndLand
Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration