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Fair Value Measurements (Details Narrative) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Warrant Liability | $ 183 | $ 425

X
- Definition Refers to carrying amount of warrant liability as on balance sheet date. + References No definition available. + Details
Name: | USEG_WarrantLiability
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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