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SCHEDULE OF IMPACT OF FIXED-PRICE DERIVATIVE CONTRACT (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |
Settlements | $ (80) |  | $ (119) |
Unrealized loss on commodity derivatives | 55 |  | (116) |
Total commodity derivative loss, net | $ (25) |  | $ (235) |

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- Definition Change in fair value of unsettled derivatives. + References No definition available. + Details
Name: | USEG_ChangeInFairValueOfUnsettledDerivatives
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Derivative settlements. + References No definition available. + Details
Name: | USEG_DerivativeSettlements
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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