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Real Estate Held for Sale - Schedule of Carrying Value and Fair Value of Real Estate Held for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Real Estate [Abstract] |  |
Estimated sales price of building and land | $ 800 | $ 800
Estimated sales price of additional land | 275 | 275
Estimated cost to sell | (100) | (100)
Estimated net proceeds | $ 975 | $ 975

X
- Definition Estimated sales price of additional land. + References No definition available. + Details
Name: | USEG_FairValueOfRealEstateHeldForSaleCostOfAdditionalLand
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated cost to sell. + References No definition available. + Details
Name: | USEG_FairValueOfRealEstateHeldForSaleCostOfSale
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated net proceeds. + References No definition available. + Details
Name: | USEG_FairValueOfRealEstateHeldForSaleEstimatedNetProceeds
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Estimated sales price of building and land. + References No definition available. + Details
Name: | USEG_FairValueOfRealEstateHeldForSaleOfBuildingAndLand
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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