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v3.21.2

REVENUE RECOGNITION (Details Narrative) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |
Operating revenue percentage | 30.00% | 5.00% | 31.00% | 5.00%

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- Definition Operating revenue percentage. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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