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Supplemental Oil and Natural Gas Information - Schedule of Standardized Measure of Discounted Future Net Cash Flows (Details) (Parenthetical) | Dec. 31, 2020 | Dec. 31, 2019
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Oil and Gas Exploration and Production Industries Disclosures [Abstract] |  |
Annual Discount factor | 10.00% | 10.00%

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- Definition Annual Discount factor. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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