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Note 13 - Fair Value Measurements (Details Textual) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($) a
Other Assets and Liabilities, Fair Value Measurement, Discount Rate | 10.00%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 87.7
Fair Value Measurement, Estimated Cash Flows | $ 7.3
Riverton, Wyoming Property [Member] |
Area of Land (Acre) | a | 13.84
Minimum [Member] |
Derivative, Fixed Interest Rate | 7.30%
Maximum [Member] |
Derivative, Fixed Interest Rate | 19.00%

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the estimated cash flows used in fair value measurement. + References No definition available. + Details
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Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the discount rate used in fair value measurement on other assets and liabilities. + References No definition available. + Details
Name: | useg_OtherAssetsAndLiabilitiesFairValueMeasurementDiscountRate
Namespace Prefix: | useg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |