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Note 16 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Crude Oil Swaps [Member] | Apr. 02, 2024 $ / bbl bbl
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Derivative, Nonmonetary Notional Amount, Volume (Barrel of Oil) | bbl | 164,125
Derivative, Floor Price (in USD per Barrel of Oil) | $ / bbl | 73.71

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- Definition Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=useg_CrudeOilSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |