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Note 7 - Commodity Derivatives - Schedule of Derivative Gains (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Total commodity derivative settlement gain (loss)	$ 0	$ 1,856	$ 0	$ 2,381
Commodity derivative gain, net	0	2,030	0	537
Oil Contracts [Member]
Total commodity derivative settlement gain (loss)	0	1,856	0	2,381
Commodity derivative gain, net	$ 0	$ 2,030	$ 0	$ 537

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

+ Details

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

X

- Definition

Represents the amount of gain (loss) on derivative settlements.

+ References

No definition available.

+ Details

Name:	useg_DerivativeSettlementGainLoss
Namespace Prefix:	useg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=useg_OilContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: