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Subsequent Events (Details Narrative) - Subsequent Event [Member] $ in Thousands | 1 Months Ended
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Oct. 31, 2018 USD ($)
Drilling cost paid | $ 900
Working interest percentage | 30.00%

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- Definition Drilling cost paid. + References No definition available. + Details
Name: | USEG_DrillingCostPaid
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Working interest percentage. + References No definition available. + Details
Name: | USEG_WorkingInterestPercentage
Namespace Prefix: | USEG_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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