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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense (benefit) [Abstract]      
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income tax expense (benefit) 0useg_CurrentIncomeTaxExpenseBenefitIncludingDiscontinuedOperations 0useg_CurrentIncomeTaxExpenseBenefitIncludingDiscontinuedOperations 0useg_CurrentIncomeTaxExpenseBenefitIncludingDiscontinuedOperations
Deferred income tax expense (benefit) [Abstract]      
Federal 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,093,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (64,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax expense (benefit) 0useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations 0useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations (1,157,000)useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations
Effective income tax reconciliation [Abstract]      
Federal statutory income tax rate (711,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (2,509,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (4,164,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit (34,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (158,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (245,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Incentive stock options 79,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 43,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 12,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Percent depletion carryover (129,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (174,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (177,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
Valuation analysis 612,000useg_IncomeTaxReconciliationValuationAllowance 2,717,000useg_IncomeTaxReconciliationValuationAllowance 3,512,000useg_IncomeTaxReconciliationValuationAllowance
Other 183,000us-gaap_IncomeTaxReconciliationOtherAdjustments 81,000us-gaap_IncomeTaxReconciliationOtherAdjustments (95,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total deferred income tax expense (benefit) 0useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations 0useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations (1,157,000)useg_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations
Deferred tax assets [Abstract]      
Net operating loss 10,382,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 6,930,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Derivative instruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments 96,000us-gaap_DeferredTaxAssetsDerivativeInstruments  
Asset retirement obligation 404,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 294,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations  
Stock based compensation 248,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 228,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Deferred compensation 439,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 385,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Alternative minimum tax credit 706,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 706,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Contribution carryover 42,000us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 37,000us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards  
Equity investments 629,000us-gaap_DeferredTaxAssetsInvestments 643,000us-gaap_DeferredTaxAssetsInvestments  
Percentage depletion carryover 2,402,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,421,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Total deferred tax assets 15,252,000us-gaap_DeferredTaxAssetsGross 11,740,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities [Abstract]      
Property and equipment (8,351,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (5,446,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
State tax (3,000)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome (9,000)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome  
Marketable securities 0us-gaap_DeferredTaxLiabilitiesInvestments (16,000)us-gaap_DeferredTaxLiabilitiesInvestments  
Total deferred tax liabilities (8,354,000)us-gaap_DeferredIncomeTaxLiabilities (5,471,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets (liabilities) 6,898,000useg_DeferredTaxAssetsLiabilities 6,269,000useg_DeferredTaxAssetsLiabilities  
Less: Valuation Allowance (6,898,000)us-gaap_DeferredTaxAssetsValuationAllowance (6,269,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred tax liability 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet  
Increase in deferred tax assets 3,500,000useg_IncreaseDecreaseInDeferredTaxAssets    
Increase in deferred tax liability 2,900,000useg_IncreaseDecreaseInDeferredTaxLiability    
Increase in net deferred tax assets 629,000us-gaap_IncreaseDecreaseInDeferredIncomeTaxes    
Operating Loss Carryforwards [Line Items]      
Net operating loss carryovers 29,600,000us-gaap_OperatingLossCarryforwards    
Tax deductions for compensation expense 2,800,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation    
Net operating loss carry back period 2 years    
Net operating loss carry forward period 20 years    
Adjustments for uncertain tax positions 0us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease    
Penalties and interest accrued related to uncertain tax positions 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryovers $ 32,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember