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Shareholders' Equity - Schedule of Stock Options Activity (Details) - $ / shares | Mar. 31, 2021 | Dec. 31, 2020
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Stockholders' Equity Note [Abstract] |  |
Stock options outstanding and exercisable, shares | 31,367 | 31,367
Stock options outstanding and exercisable, price | $ 64.78 | $ 64.78

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- Definition Stock options outstanding and exercisable, shares. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Stock options outstanding and exercisable, price. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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