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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |
Oil sales | $ 28,331 useg_OilSales | $ 31,214 useg_OilSales | $ 30,772 useg_OilSales
Gas sales | 2,663 useg_GasSales | 1,901 useg_GasSales | 1,131 useg_GasSales
NGL sales | 1,385 useg_NGLSales | 532 useg_NGLSales | 631 useg_NGLSales
Total revenues | 32,379 us-gaap_OilAndGasRevenue | 33,647 us-gaap_OilAndGasRevenue | 32,534 us-gaap_OilAndGasRevenue
Operating expenses: |  |  |
Oil and gas | 10,638 us-gaap_CostOfGoodsSoldOilAndGas | 10,469 us-gaap_CostOfGoodsSoldOilAndGas | 10,788 us-gaap_CostOfGoodsSoldOilAndGas
Oil and gas depreciation, depletion and amortization | 14,685 us-gaap_DepletionOfOilAndGasProperties | 13,623 us-gaap_DepletionOfOilAndGasProperties | 14,893 us-gaap_DepletionOfOilAndGasProperties
Impairment of oil and gas properties | 0 us-gaap_ImpairmentOfOilAndGasProperties | 5,828 us-gaap_ImpairmentOfOilAndGasProperties | 5,189 us-gaap_ImpairmentOfOilAndGasProperties
Water treatment plant | 1,875 us-gaap_WaterProductionCosts | 1,817 us-gaap_WaterProductionCosts | 1,978 us-gaap_WaterProductionCosts
Mineral holding costs | 1,110 us-gaap_MineralExtractionProcessingAndMarketingCosts | 1,228 us-gaap_MineralExtractionProcessingAndMarketingCosts | 921 us-gaap_MineralExtractionProcessingAndMarketingCosts
General and administrative | 6,559 us-gaap_OtherSellingGeneralAndAdministrativeExpense | 5,528 us-gaap_OtherSellingGeneralAndAdministrativeExpense | 6,675 us-gaap_OtherSellingGeneralAndAdministrativeExpense
Impairment of corporate aircraft | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 2,299 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Total operating expenses | 34,867 us-gaap_CostsAndExpenses | 38,493 us-gaap_CostsAndExpenses | 42,743 us-gaap_CostsAndExpenses
Loss from operations | (2,488)us-gaap_OperatingIncomeLoss | (4,846)us-gaap_OperatingIncomeLoss | (10,209)us-gaap_OperatingIncomeLoss
Other income and (expenses): |  |  |
Realized gain (loss) on risk management activities | 316 us-gaap_GainLossFromPriceRiskManagementActivity | (338)us-gaap_GainLossFromPriceRiskManagementActivity | 21 us-gaap_GainLossFromPriceRiskManagementActivity
Unrealized gain (loss) on risk management activities | 266 us-gaap_UnrealizedGainLossOnDerivatives | (737)us-gaap_UnrealizedGainLossOnDerivatives | 1,070 us-gaap_UnrealizedGainLossOnDerivatives
Gain (loss) on the sale of assets | 112 us-gaap_GainsLossesOnSalesOfAssets | 760 us-gaap_GainsLossesOnSalesOfAssets | (12)us-gaap_GainsLossesOnSalesOfAssets
Equity (loss) in unconsolidated investment | 0 us-gaap_IncomeLossFromEquityMethodInvestments | (104)us-gaap_IncomeLossFromEquityMethodInvestments | (359)us-gaap_IncomeLossFromEquityMethodInvestments
Impairment of unconsolidated investment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | (2,160)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Gain on sale of marketable securities | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | 82 us-gaap_GainLossOnSaleOfSecuritiesNet
Miscellaneous income | 84 us-gaap_OtherSalesRevenueNet | 160 us-gaap_OtherSalesRevenueNet | 241 us-gaap_OtherSalesRevenueNet
Interest income | 4 us-gaap_InvestmentIncomeInterest | 8 us-gaap_InvestmentIncomeInterest | 9 us-gaap_InvestmentIncomeInterest
Interest expense | (385)us-gaap_InterestExpense | (429)us-gaap_InterestExpense | (338)us-gaap_InterestExpense
Total other income (expenses) | 397 us-gaap_NonoperatingIncomeExpense | (2,840)us-gaap_NonoperatingIncomeExpense | 714 us-gaap_NonoperatingIncomeExpense
Loss before income taxes and discontinued operations | (2,091)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (7,686)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (9,495)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes: |  |  |
Current (provision for) | 0 us-gaap_CurrentIncomeTaxExpenseBenefit | 0 us-gaap_CurrentIncomeTaxExpenseBenefit | (104)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred benefit from | 0 us-gaap_DeferredIncomeTaxExpenseBenefit | 0 us-gaap_DeferredIncomeTaxExpenseBenefit | 148 us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | 44 us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations | (2,091)us-gaap_IncomeLossFromContinuingOperations | (7,686)us-gaap_IncomeLossFromContinuingOperations | (9,451)us-gaap_IncomeLossFromContinuingOperations
Discontinued operations: |  |  |
Discontinued operations, net of taxes | 0 useg_TotalIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 427 useg_TotalIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 97 useg_TotalIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Loss on sale of discontinued operations, net of taxes | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (120)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Impairment on discontinued operations, net of taxes | 0 useg_DiscontinuedOperationLossGainOnWriteDown | 0 useg_DiscontinuedOperationLossGainOnWriteDown | (1,891)useg_DiscontinuedOperationLossGainOnWriteDown
Net income (loss) from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 307 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,794)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net loss | $ (2,091)us-gaap_NetIncomeLoss | $ (7,379)us-gaap_NetIncomeLoss | $ (11,245)us-gaap_NetIncomeLoss
Earnings (loss) per share basic and diluted |  |  |
Earnings (loss) from continuing operations (in dollars per share) | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.34)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Earnings (loss) from discontinued operations (in dollars per share) | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Earnings (loss) per share (in dollars per share) | $ (0.08)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.27)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.41)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding |  |  |
Basic and Diluted (in shares) | 27,832,859 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 27,678,698 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 27,466,549 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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