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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
OPERATING REVENUES        
Oil and gas sales $ 6,667,618us-gaap_OilAndGasSalesRevenue $ 4,343,739us-gaap_OilAndGasSalesRevenue $ 24,816,633us-gaap_OilAndGasSalesRevenue $ 12,559,344us-gaap_OilAndGasSalesRevenue
Gas transportation, gathering, and processing 44,256us-gaap_NaturalGasMidstreamRevenue 35,203us-gaap_NaturalGasMidstreamRevenue 121,875us-gaap_NaturalGasMidstreamRevenue 97,093us-gaap_NaturalGasMidstreamRevenue
Other income 63,407us-gaap_OtherSalesRevenueNet 25,801us-gaap_OtherSalesRevenueNet 69,840us-gaap_OtherSalesRevenueNet 28,790us-gaap_OtherSalesRevenueNet
Total operating revenues 6,775,281us-gaap_OilAndGasRevenue 4,404,743us-gaap_OilAndGasRevenue 25,008,348us-gaap_OilAndGasRevenue 12,685,227us-gaap_OilAndGasRevenue
OPERATING COSTS AND EXPENSES        
Production costs 3,258,132us-gaap_ExplorationAndProductionCosts 2,795,073us-gaap_ExplorationAndProductionCosts 10,003,364us-gaap_ExplorationAndProductionCosts 7,363,564us-gaap_ExplorationAndProductionCosts
Depreciation, depletion, amortization and accretion 3,088,104us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions 986,670us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions 7,448,799us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions 2,365,280us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
Environmental settlement and related costs 6,600,000us-gaap_EnvironmentalRemediationExpense   6,600,000us-gaap_EnvironmentalRemediationExpense  
Selling, general and administrative 1,176,853us-gaap_SellingGeneralAndAdministrativeExpense 1,633,112us-gaap_SellingGeneralAndAdministrativeExpense 4,159,149us-gaap_SellingGeneralAndAdministrativeExpense 4,733,539us-gaap_SellingGeneralAndAdministrativeExpense
Total operating costs and expenses 14,123,089us-gaap_CostsAndExpenses 5,414,855us-gaap_CostsAndExpenses 28,211,312us-gaap_CostsAndExpenses 14,462,383us-gaap_CostsAndExpenses
(Loss) Gain on sale of assets (18,480)us-gaap_GainLossOnDispositionOfAssets 6,887us-gaap_GainLossOnDispositionOfAssets 188,616us-gaap_GainLossOnDispositionOfAssets (1,900)us-gaap_GainLossOnDispositionOfAssets
LOSS FROM OPERATIONS (7,366,288)us-gaap_OperatingIncomeLoss (1,003,225)us-gaap_OperatingIncomeLoss (3,014,348)us-gaap_OperatingIncomeLoss (1,779,056)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSES)        
Interest income 550us-gaap_InvestmentIncomeInterest 3,463us-gaap_InvestmentIncomeInterest 2,045us-gaap_InvestmentIncomeInterest 18,142us-gaap_InvestmentIncomeInterest
Interest expense (2,903,312)us-gaap_InterestExpense (5,200,628)us-gaap_InterestExpense (16,709,264)us-gaap_InterestExpense (11,002,002)us-gaap_InterestExpense
Gain on warrant derivatives   3,806teng_DerivativeGainLossOnWarrantNet   595,245teng_DerivativeGainLossOnWarrantNet
Gain (loss) on derivative assets 2,963,096us-gaap_DerivativeGainLossOnDerivativeNet 100,796us-gaap_DerivativeGainLossOnDerivativeNet (62,533)us-gaap_DerivativeGainLossOnDerivativeNet 760,152us-gaap_DerivativeGainLossOnDerivativeNet
Total other income (expenses) 60,334us-gaap_NonoperatingIncomeExpense (5,092,563)us-gaap_NonoperatingIncomeExpense (16,769,752)us-gaap_NonoperatingIncomeExpense (9,628,463)us-gaap_NonoperatingIncomeExpense
NET LOSS BEFORE INCOME TAXES (7,305,954)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (6,095,788)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (19,784,100)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (11,407,519)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
INCOME TAX 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit
NET LOSS $ (7,305,954)us-gaap_NetIncomeLoss $ (6,095,788)us-gaap_NetIncomeLoss $ (19,784,100)us-gaap_NetIncomeLoss $ (11,407,519)us-gaap_NetIncomeLoss
NET LOSS PER SHARE - BASIC AND DILUTED $ (0.52)us-gaap_EarningsPerShareBasicAndDiluted $ (0.46)us-gaap_EarningsPerShareBasicAndDiluted $ (1.44)us-gaap_EarningsPerShareBasicAndDiluted $ (0.86)us-gaap_EarningsPerShareBasicAndDiluted
WEIGHTED AVERAGE SHARES - BASIC AND DILUTED 14,026,790us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,317,978us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,742,149us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,264,077us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted