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COMMODITY PRICE RISK MANAGEMENT (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Liability, Fair Value, Net [Abstract] |  |  |
Realized derivative (loss) gain | $ 316 us-gaap_GainLossFromPriceRiskManagementActivity | $ (338)us-gaap_GainLossFromPriceRiskManagementActivity | $ 21 us-gaap_GainLossFromPriceRiskManagementActivity
Unrealized derivative (loss) gain | 266 us-gaap_UnrealizedGainLossOnDerivatives | (737)us-gaap_UnrealizedGainLossOnDerivatives | 1,070 us-gaap_UnrealizedGainLossOnDerivatives
Total realized and unrealized derivative (loss) gain | 582 us-gaap_DerivativeGainLossOnDerivativeNet | (1,075)us-gaap_DerivativeGainLossOnDerivativeNet | 1,091 us-gaap_DerivativeGainLossOnDerivativeNet
Current Asset [Member] | Crude Oil Derivative Contract [Member] |  |  |
Derivative Asset, Fair Value, Net [Abstract] |  |  |
Derivative Assets, Fair Gross |  | 345 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Derivative Asset, Gross amount offset in |  | (331)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Derivative Asset, Net amount of assets |  | 14 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Current Liability [Member] | Crude Oil Derivative Contract [Member] |  |  |
Derivative Liability, Fair Value, Net [Abstract] |  |  |
Derivative Liability, Gross |  | 611 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |
Derivative Liabilities, Gross amount offset in |  | (331)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |
Derivative Liability, Net amount of assets |  | $ 280 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Gain (loss) incurred in risk management activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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