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DISCONTINUED OPERATIONS (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 11, 2013
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) on sale of discontinued of operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ (120,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Results of discontinued operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (3,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (128,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 206,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 232,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (548,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (75,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,235,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 64,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 307,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,794,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Depreciation of assets held for sale not recorded |  |  |  |  |  |  |  |  |  |  |  |  |  | 660,000 useg_DepreciationOfAssetsHeldForSaleNotRecorded | 896,000 useg_DepreciationOfAssetsHeldForSaleNotRecorded |
Real Estate Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of discontinued operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 1,271,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 2,037,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 844,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 1,885,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Impairment |  |  |  |  |  |  |  |  |  |  |  |  | 0 useg_DisposalGroupIncludingDiscontinuedOperationsImpairment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 0 useg_DisposalGroupIncludingDiscontinuedOperationsImpairment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 2,955,000 useg_DisposalGroupIncludingDiscontinuedOperationsImpairment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 844,000 useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 4,840,000 useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 427,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | (2,803,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 0 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 1,009,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Net income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | 427,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember | (1,794,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RealEstateOperationsMember |
Remington Village Multifamily [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling price of asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RemingtonVillageMultifamilyMember
Commercial note due |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RemingtonVillageMultifamilyMember
Net proceeds on transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 useg_NetProceedsOnTransaction / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RemingtonVillageMultifamilyMember
(Loss) on sale of discontinued of operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (120,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = useg_RemingtonVillageMultifamilyMember

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