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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net (loss) | $ (2,091)us-gaap_NetIncomeLoss | $ (7,379)us-gaap_NetIncomeLoss | $ (11,245)us-gaap_NetIncomeLoss
(Gain) loss from discontinued operations includes non-cash impairment of $-0-, $-0-, and $1,891 | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (307)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,794 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Loss from continuing operations | (2,091)us-gaap_IncomeLossFromContinuingOperations | (7,686)us-gaap_IncomeLossFromContinuingOperations | (9,451)us-gaap_IncomeLossFromContinuingOperations
Adjustments to reconcile net loss to net cash provided by operations |  |  |
Depreciation, depletion & amortization | 14,956 us-gaap_DepreciationDepletionAndAmortization | 13,898 us-gaap_DepreciationDepletionAndAmortization | 15,457 us-gaap_DepreciationDepletionAndAmortization
Change in fair value of commodity price risk management activities, net | (266)us-gaap_UnrealizedGainLossOnDerivatives | 737 us-gaap_UnrealizedGainLossOnDerivatives | (1,070)us-gaap_UnrealizedGainLossOnDerivatives
Impairment of oil and gas properties | 0 us-gaap_ImpairmentOfOilAndGasProperties | 5,828 us-gaap_ImpairmentOfOilAndGasProperties | 5,189 us-gaap_ImpairmentOfOilAndGasProperties
Impairment of equity investment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 2,160 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Impairment of corporate aircraft | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 2,299 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Gain on sale of marketable securities | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | (82)us-gaap_GainLossOnSaleOfSecuritiesNet
Equity loss from Standard Steam | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 104 us-gaap_IncomeLossFromEquityMethodInvestments | 359 us-gaap_IncomeLossFromEquityMethodInvestments
Net change in deferred income taxes | 0 us-gaap_DeferredIncomeTaxesAndTaxCredits | 0 us-gaap_DeferredIncomeTaxesAndTaxCredits | (60)us-gaap_DeferredIncomeTaxesAndTaxCredits
(Gain) loss on sale of assets | (112)us-gaap_GainsLossesOnSalesOfAssets | (760)us-gaap_GainsLossesOnSalesOfAssets | 12 us-gaap_GainsLossesOnSalesOfAssets
Noncash compensation | 1,024 us-gaap_ShareBasedCompensation | 452 us-gaap_ShareBasedCompensation | 518 us-gaap_ShareBasedCompensation
Noncash services | 88 us-gaap_OtherNoncashExpense | 64 us-gaap_OtherNoncashExpense | 69 us-gaap_OtherNoncashExpense
Net changes in assets and liabilities |  |  |
Accounts receivable | 2,571 us-gaap_IncreaseDecreaseInAccountsReceivable | (1,619)us-gaap_IncreaseDecreaseInAccountsReceivable | 315 us-gaap_IncreaseDecreaseInAccountsReceivable
Income tax receivable | 0 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | 0 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | 113 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other current assets | 165 us-gaap_IncreaseDecreaseInOtherCurrentAssets | 8 us-gaap_IncreaseDecreaseInOtherCurrentAssets | 230 us-gaap_IncreaseDecreaseInOtherCurrentAssets
Over payments by operators | 3,983 useg_IncreaseDecreaseInOverPaymentsByOperators | 0 useg_IncreaseDecreaseInOverPaymentsByOperators | 0 useg_IncreaseDecreaseInOverPaymentsByOperators
Accounts payable | 909 us-gaap_IncreaseDecreaseInAccountsPayable | 3,617 us-gaap_IncreaseDecreaseInAccountsPayable | (476)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation expense | (436)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 172 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | (336)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other liabilities | (39)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | 123 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | 53 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Net cash provided by operating activities | 20,752 us-gaap_NetCashProvidedByUsedInOperatingActivities | 17,098 us-gaap_NetCashProvidedByUsedInOperatingActivities | 13,139 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |  |
Acquisition & development of oil & gas properties | (29,831)us-gaap_PaymentsToAcquireOilAndGasProperty | (20,757)us-gaap_PaymentsToAcquireOilAndGasProperty | (42,311)us-gaap_PaymentsToAcquireOilAndGasProperty
Acquisition of property and equipment | (1,213)us-gaap_PaymentsToAcquireMachineryAndEquipment | (42)us-gaap_PaymentsToAcquireMachineryAndEquipment | (102)us-gaap_PaymentsToAcquireMachineryAndEquipment
Proceeds from sale of oil and gas properties | 11,515 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | 0 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | 21,475 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Proceeds from sale of marketable securities | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 101 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from sale of property and equipment | 109 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 2,628 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 76 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net change in restricted investments | (122)us-gaap_IncreaseDecreaseOfRestrictedInvestments | (48)us-gaap_IncreaseDecreaseOfRestrictedInvestments | (116)us-gaap_IncreaseDecreaseOfRestrictedInvestments
Net cash (used in) investing activities: | (19,542)us-gaap_NetCashProvidedByUsedInInvestingActivities | (18,219)us-gaap_NetCashProvidedByUsedInInvestingActivities | (20,877)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |  |
Issuance of common stock | (55)us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 51 us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from new debt | 8,000 us-gaap_ProceedsFromRepaymentsOfDebt | 2,000 us-gaap_ProceedsFromRepaymentsOfDebt | 10,000 us-gaap_ProceedsFromRepaymentsOfDebt
Repayments of debt | (11,000)us-gaap_ProceedsFromRepaymentsOfSecuredDebt | (12,821)us-gaap_ProceedsFromRepaymentsOfSecuredDebt | (12,484)us-gaap_ProceedsFromRepaymentsOfSecuredDebt
Net cash (used in) financing activities | (3,055)us-gaap_NetCashProvidedByUsedInFinancingActivities | (10,821)us-gaap_NetCashProvidedByUsedInFinancingActivities | (2,433)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by operating activities of discontinued operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 317 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 122 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by investing activities of discontinued operations | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | 14,655 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash provided by discontinued operations | 0 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | 14,972 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | 122 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Net (decrease) increase in cash and cash equivalents | (1,845)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 3,030 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (10,049)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 5,855 us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,825 us-gaap_CashAndCashEquivalentsAtCarryingValue | 12,874 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 4,010 us-gaap_CashAndCashEquivalentsAtCarryingValue | 5,855 us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,825 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures: |  |  |
Income tax paid | 0 us-gaap_IncomeTaxesPaid | 0 us-gaap_IncomeTaxesPaid | 0 us-gaap_IncomeTaxesPaid
Interest paid | 385 us-gaap_InterestPaid | 274 us-gaap_InterestPaid | 179 us-gaap_InterestPaid
Non-cash investing and financing activities: |  |  |
Unrealized gain on marketable securities | 56 us-gaap_MarketableSecuritiesUnrealizedGainLoss | 12 us-gaap_MarketableSecuritiesUnrealizedGainLoss | 101 us-gaap_MarketableSecuritiesUnrealizedGainLoss
Acquisition and development of oil and gas properties through accounts payable | 2,565 useg_AcquisitionAndDevelopmentOfOilAndGasPropertiesThroughAccountsPayable | 142 useg_AcquisitionAndDevelopmentOfOilAndGasPropertiesThroughAccountsPayable | 6,202 useg_AcquisitionAndDevelopmentOfOilAndGasPropertiesThroughAccountsPayable
Net additions to oil and gas properties through asset retirement obligations | $ 281 useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations | $ 131 useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations | $ 142 useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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