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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                         $ 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ (120,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Results of discontinued operations [Abstract]                                
Net income (loss) from discontinued operations 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (3,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (128,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 206,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 232,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (548,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (75,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1,235,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 64,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 307,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1,794,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax  
Depreciation of assets held for sale not recorded                           660,000useg_DepreciationOfAssetsHeldForSaleNotRecorded 896,000useg_DepreciationOfAssetsHeldForSaleNotRecorded  
Real Estate Operations [Member]                                
Results of discontinued operations [Abstract]                                
Revenues                         0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
1,271,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
2,037,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Operating expenses                         0us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
844,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
1,885,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Impairment                         0useg_DisposalGroupIncludingDiscontinuedOperationsImpairment
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
0useg_DisposalGroupIncludingDiscontinuedOperationsImpairment
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
2,955,000useg_DisposalGroupIncludingDiscontinuedOperationsImpairment
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Total operating expenses                         0useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
844,000useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
4,840,000useg_DisposalGroupIncludingDiscontinuedOperationTotalOperatingExpense
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Income (loss) before income taxes                         0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
427,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
(2,803,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Income tax benefit                         0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
1,009,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
 
Net income (loss) from discontinued operations                         0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RealEstateOperationsMember
427,000us-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                               15,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RemingtonVillageMultifamilyMember
Commercial note due                               9,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RemingtonVillageMultifamilyMember
Net proceeds on transaction                               5,000,000useg_NetProceedsOnTransaction
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RemingtonVillageMultifamilyMember
(Loss) on sale of discontinued of operations                               $ (120,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= useg_RemingtonVillageMultifamilyMember