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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net (loss) income:	$ (23,703)us-gaap_NetIncomeLoss	$ 250us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash provided by operations
Depreciation, depletion & amortization	2,941us-gaap_DepreciationDepletionAndAmortization	3,362us-gaap_DepreciationDepletionAndAmortization
Change in fair value of commodity price risk management activities, net	63us-gaap_UnrealizedGainLossOnDerivatives	173us-gaap_UnrealizedGainLossOnDerivatives
Impairment of oil and gas properties	19,240us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
(Gain) on sale of assets	(16)us-gaap_GainsLossesOnSalesOfAssets	(28)us-gaap_GainsLossesOnSalesOfAssets
Noncash compensation	158us-gaap_ShareBasedCompensation	143us-gaap_ShareBasedCompensation
Noncash services	20us-gaap_OtherNoncashExpense	17us-gaap_OtherNoncashExpense
Accounts payable	567us-gaap_IncreaseDecreaseInAccountsPayable	270us-gaap_IncreaseDecreaseInAccountsPayable
Overpayment by operators	742useg_IncreaseDecreaseInOverPaymentsByOperators	128useg_IncreaseDecreaseInOverPaymentsByOperators
Net changes in assets and liabilities	1,809us-gaap_IncreaseDecreaseInOperatingCapital	54us-gaap_IncreaseDecreaseInOperatingCapital
Net cash provided by operating activities	1,821us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	4,369us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:
Acquisition and development of oil and gas properties	(1,843)us-gaap_PaymentsToAcquireOilAndGasProperty	(8,495)us-gaap_PaymentsToAcquireOilAndGasProperty
Acquisition of property, plant and equipment	(4)us-gaap_PaymentsToAcquireMachineryAndEquipment	(1,202)us-gaap_PaymentsToAcquireMachineryAndEquipment
Proceeds from sale of property and equipment	16us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment	28us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net change in restricted investments	(24)us-gaap_IncreaseDecreaseOfRestrictedInvestments	(16)us-gaap_IncreaseDecreaseOfRestrictedInvestments
Net cash (used in) investing activities:	(1,855)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(9,685)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:
Issuance of common stock	0us-gaap_ProceedsFromIssuanceOfCommonStock	(27)us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from new debt	0us-gaap_ProceedsFromRepaymentsOfDebt	2,000us-gaap_ProceedsFromRepaymentsOfDebt
Net cash provided by financing activities	0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	1,973us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) in cash and cash equivalents	(34)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(3,343)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period	4,010us-gaap_CashAndCashEquivalentsAtCarryingValue	5,855us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period	3,976us-gaap_CashAndCashEquivalentsAtCarryingValue	2,512us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures:
Interest paid	63us-gaap_InterestPaid	96us-gaap_InterestPaid
Non-cash investing and financing activities:
Unrealized change from available for sale securities	0us-gaap_MarketableSecuritiesUnrealizedGainLoss	25us-gaap_MarketableSecuritiesUnrealizedGainLoss
Acquisition and development of oil and gas properties through accounts payable	128useg_AcquisitionAndDevelopmentOfOilAndGasPropertiesThroughAccountsPayable	596useg_AcquisitionAndDevelopmentOfOilAndGasPropertiesThroughAccountsPayable
Acquisition and development of oil and gas properties through asset retirement obligations	$ 33useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations	$ 76useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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