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Organization, Operations and Significant Accounting Policies - Schedule of Property and Equipment Useful Life (Details) | 12 Months Ended
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Dec. 31, 2020
Computers and Software [Member] | Minimum [Member] |
Estimated useful lives | 3 years
Computers and Software [Member] | Maximum [Member] |
Estimated useful lives | 10 years
Office Furniture and Fixtures [Member] | Minimum [Member] |
Estimated useful lives | 5 years
Office Furniture and Fixtures [Member] | Maximum [Member] |
Estimated useful lives | 20 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=USEG_ComputersAndSoftwareMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |