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Note 5 - Oil and Natural Gas Producing Activities (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) $ / item	Mar. 31, 2024 USD ($)
Oil and Gas Property, Ceiling Test, Discount Rate	10.00%
Impairment, Oil and Gas, Property with Unproved and Proved Reserves | $	$ 0	$ 5,419
Crude Oil [Member]
Oil and Gas, Average Sale Price Per Unit (in USD per Per Share)	74.52
Natural Gas and Natural Gas Liquids (NGL) [Member]
Oil and Gas, Average Sale Price Per Unit (in USD per Per Share)	2.44

X

- Definition

Average sale price per unit of oil or gas produced.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph b
-Subparagraph (1)
-Publisher SEC

+ Details

Name:	srt_AverageSalesPrices
Namespace Prefix:	srt_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of impairment loss for oil and gas properties with proved and unproved reserves in oil- and gas-producing activities.

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-2

+ Details

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

X

- Definition

Represents the discount rate used in a ceiling test for oil and gas property.

+ References

No definition available.

+ Details

Name:	useg_OilAndGasPropertyCeilingTestDiscountRate
Namespace Prefix:	useg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_EnergyAxis=srt_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=srt_NaturalGasPerThousandCubicFeetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: