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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Oil sales	$ 2,297useg_OilSales	$ 7,574useg_OilSales
Gas sales	331useg_GasSales	481useg_GasSales
NGL sales	51useg_NGLSales	201useg_NGLSales
Total Revenues	2,679us-gaap_OilAndGasRevenue	8,256us-gaap_OilAndGasRevenue
Operating expenses:
Oil and gas	1,852us-gaap_CostOfGoodsSoldOilAndGas	1,972us-gaap_CostOfGoodsSoldOilAndGas
Oil and gas depreciation, depletion and amortization	2,874us-gaap_DepletionOfOilAndGasProperties	3,294us-gaap_DepletionOfOilAndGasProperties
Impairment of oil and gas properties	19,240us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Water treatment plant	458us-gaap_WaterProductionCosts	457us-gaap_WaterProductionCosts
Mineral holding costs	295us-gaap_MineralExtractionProcessingAndMarketingCosts	300us-gaap_MineralExtractionProcessingAndMarketingCosts
General and administrative	1,479us-gaap_OtherSellingGeneralAndAdministrativeExpense	1,606us-gaap_OtherSellingGeneralAndAdministrativeExpense
Total operating expenses	26,198us-gaap_CostsAndExpenses	7,629us-gaap_CostsAndExpenses
(Loss) income from operations	(23,519)us-gaap_OperatingIncomeLoss	627us-gaap_OperatingIncomeLoss
Other income and (expenses):
Realized (loss) on risk management activities	(114)us-gaap_GainLossFromPriceRiskManagementActivity	(158)us-gaap_GainLossFromPriceRiskManagementActivity
Unrealized (loss) on risk management activities	(63)us-gaap_UnrealizedGainLossOnDerivatives	(173)us-gaap_UnrealizedGainLossOnDerivatives
Gain on the sale of assets	16us-gaap_GainsLossesOnSalesOfAssets	28us-gaap_GainsLossesOnSalesOfAssets
Miscellaneous income	39us-gaap_OtherSalesRevenueNet	21us-gaap_OtherSalesRevenueNet
Interest income	1us-gaap_InvestmentIncomeInterest	1us-gaap_InvestmentIncomeInterest
Interest expense	(63)us-gaap_InterestExpense	(96)us-gaap_InterestExpense
Total other income and (expenses)	(184)us-gaap_NonoperatingIncomeExpense	(377)us-gaap_NonoperatingIncomeExpense
(Loss) income before income taxes	(23,703)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	250us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes:
Current (provision for)	0us-gaap_CurrentIncomeTaxExpenseBenefit	0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred benefit from	0us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	$ (23,703)us-gaap_NetIncomeLoss	$ 250us-gaap_NetIncomeLoss
(Loss) Earnings per share basic and diluted
(Loss) earnings	$ (0.85)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ 0.01us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
(Loss) Earnings per share basic and diluted (in dollars per share)	$ (0.85)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding
Basic (in shares)	28,047,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,738,083us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	28,047,661us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,142,253us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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