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Write-Off of Deposit (Details Narrative) - Letter of Intent [Member] - Clean Energy Technology Association, Inc. [Member] - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Option purchased to acquire shares | 50 |
Option payment | $ 250 | $ 124
Allowance due to uncertainity of collection of deposit |  | $ 374

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- Definition Allowance due to uncertainity of collection of deposit. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Option payment. + References No definition available. + Details
Name: | USEG_OptionPayment
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Option purchased to acquire shares. + References No definition available. + Details
Name: | USEG_OptionPurchasedToAcquireShares
Namespace Prefix: | USEG_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=USEG_LetterOfIntentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=USEG_CleanEnergyTechnologyAssociationIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |