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Revenue Recognition - Schedule of Disaggregated Revenue (Details) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Reversal of an over accrual |  | $ 22
Negative realized price | negative realized price of $0.95 per Mcfe |

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- Definition Negative realized price. + References No definition available. + Details
Name: | USEG_NegativeRealizedPriceDescription
Namespace Prefix: | USEG_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reversal of an over accrual. + References No definition available. + Details
Name: | USEG_ReversalOfAnOverAccrual
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration