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Commodity Price Risk Derivatives - Schedule of Outstanding Crude Oil and Natural Gas Swaps (Details) - Swap [Member] | 12 Months Ended
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Dec. 31, 2017 $ / bbl $ / Mcf bbl Mcf
Natural Gas (mcfe) [Member] | Purchase [Member] |
Begin | Jan. 01, 2018
End | Dec. 31, 2018
Quantity | Mcf | 2,500
Price | $ / Mcf | 3.01
Natural Gas (mcfe) [Member] | Sales [Member] |
Begin | Jan. 01, 2018
End | Dec. 31, 2018
Quantity | Mcf | 2,000
Price | $ / Mcf | 2.98
Crude Oil [Member] | Purchase [Member] |
Begin | Jan. 01, 2018
End | Jun. 30, 2018
Quantity | bbl | 150
Price | $ / bbl | 52.20

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- Definition It represents the amount of crude oil and natural gas quantity outstanding. + References No definition available. + Details
Name: | USEG_OutstandingCrudeOilAndNaturalGasQuantity
Namespace Prefix: | USEG_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition The average consolidated production costs (lifting costs) per unit of production. Costs may include costs incurred to operate and maintain wells and equipment and to pay production taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (2) + Details
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Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_IncomeStatementLocationAxis=USEG_PurchaseMember
Namespace Prefix: |
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Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |