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Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Asset Retirement Obligations, Relief Through Disposals	$ 500
Wells and Overriding Royalty Interests in North Dakota, New Mexico, and Texas [Member]
Proceeds from Sale of Oil and Gas Property and Equipment	7,000
Disposal Group,Transaction Costs	$ 400
Number of Wells Sold	152
Number of Overriding Royalty Interests Sold	7
Gain (Loss) on Disposition of Oil and Gas Property	$ 0

X

- Definition

Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_GainLossOnSaleOfOilAndGasProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of decrease in asset retirement obligations through disposals.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of transaction costs of disposal group.

+ References

No definition available.

+ Details

Name:	useg_DisposalGrouptransactionCosts
Namespace Prefix:	useg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of overriding royalty interests sold.

+ References

No definition available.

+ Details

Name:	useg_NumberOfOverridingRoyaltyInterestsSold
Namespace Prefix:	useg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of wells sold.

+ References

No definition available.

+ Details

Name:	useg_NumberOfWellsSold
Namespace Prefix:	useg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: