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Condensed Consolidated Balance Sheets (USD $)
Sep. 30, 2014
Dec. 31, 2013
CURRENT ASSETS    
Cash $ 1,316,254us-gaap_Cash $ 2,727,832us-gaap_Cash
Accounts receivable, trade 6,883,543us-gaap_AccountsReceivableNetCurrent 4,460,535us-gaap_AccountsReceivableNetCurrent
Accounts receivable from drilling operator 562,000us-gaap_OtherReceivablesGrossCurrent  
Accounts receivable, related parties 18,500us-gaap_AccountsReceivableRelatedPartiesCurrent 18,500us-gaap_AccountsReceivableRelatedPartiesCurrent
Derivative assets 780,148us-gaap_DerivativeAssetsCurrent  
Advance royalties   16,937teng_AdvanceRoyaltyCurrent
Prepaid expenses 1,090,689us-gaap_PrepaidExpenseCurrent 1,065,061us-gaap_PrepaidExpenseCurrent
Deferred financing costs, net of amortization of $337,054 and $1,308,817, respectively 1,028,142us-gaap_DeferredFinanceCostsCurrentNet 817,938us-gaap_DeferredFinanceCostsCurrentNet
Total current assets 11,679,276us-gaap_AssetsCurrent 9,106,803us-gaap_AssetsCurrent
OIL AND GAS PROPERTIES, USING SUCCESSFUL EFFORTS ACCOUNTING    
Proved properties 99,952,561us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod 77,961,183us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Unproved properties 7,536,331us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 15,092,783us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Pipelines 1,259,052teng_Pipelines 1,397,440teng_Pipelines
Accumulated depreciation, depletion and amortization (21,036,700)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization (14,473,069)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization
Oil and gas properties, net 87,711,244us-gaap_OilAndGasPropertySuccessfulEffortMethodNet 79,978,337us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $344,518 and $317,704, respectively 524,718us-gaap_PropertyPlantAndEquipmentNet 587,218us-gaap_PropertyPlantAndEquipmentNet
OTHER ASSETS    
Deferred financing costs 3,341,461us-gaap_DeferredFinanceCostsNet 139,076us-gaap_DeferredFinanceCostsNet
Other assets 355,381us-gaap_OtherAssetsNoncurrent 303,887us-gaap_OtherAssetsNoncurrent
Total other assets 3,696,842us-gaap_AssetsNoncurrent 442,963us-gaap_AssetsNoncurrent
TOTAL ASSETS 103,612,080us-gaap_Assets 90,115,321us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable, trade 359,836us-gaap_AccountsPayableTradeCurrent 632,795us-gaap_AccountsPayableTradeCurrent
Accounts payable due to drilling operator 6,382,401teng_AccountsPayableDrillingOperatorCurrent 2,698,302teng_AccountsPayableDrillingOperatorCurrent
Accounts payable, related party 1,500us-gaap_AccountsPayableRelatedPartiesCurrent 1,500us-gaap_AccountsPayableRelatedPartiesCurrent
Accrued expenses 4,418,063us-gaap_AccruedLiabilitiesCurrent 5,302,816us-gaap_AccruedLiabilitiesCurrent
Deferred gain on sale of assets 6,959,817us-gaap_DeferredGainOnSaleOfProperty  
Environmental settlement and related costs 3,600,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent  
Revenue payable 45,284us-gaap_AccountsPayableOtherCurrent 127,106us-gaap_AccountsPayableOtherCurrent
Commodity derivative liability 217,451us-gaap_DerivativeLiabilitiesCurrent 58,176us-gaap_DerivativeLiabilitiesCurrent
Notes payable - current 104,325,704us-gaap_NotesPayableCurrent 14,897us-gaap_NotesPayableCurrent
Notes payable, related party   205,314us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Total current liabilities 126,310,056us-gaap_LiabilitiesCurrent 9,040,906us-gaap_LiabilitiesCurrent
LONG-TERM LIABILITIES    
Notes payable, net 0us-gaap_LongTermNotesPayable 89,204,102us-gaap_LongTermNotesPayable
Environmental settlement and related costs 3,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent  
Asset retirement obligations 78,556us-gaap_AssetRetirementObligationsNoncurrent 41,440us-gaap_AssetRetirementObligationsNoncurrent
Commodity derivative liability 831,106us-gaap_DerivativeLiabilitiesNoncurrent 67,597us-gaap_DerivativeLiabilitiesNoncurrent
Total long-term liabilities 3,909,662us-gaap_LiabilitiesNoncurrent 89,313,139us-gaap_LiabilitiesNoncurrent
Total liabilities 130,219,718us-gaap_Liabilities 98,354,045us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES      
STOCKHOLDERS' EQUITY    
Preferred stock; 10,000,000 shares authorized at $0.001 par value; -0- shares issued and outstanding      
Common stock; 500,000,000 shares authorized at $0.001 par value; 14,406,260 and 13,457,978 shares issued, respectively, and 14,404,260 and 13,455,978 shares outstanding, respectively 14,406us-gaap_CommonStockValue 13,458us-gaap_CommonStockValue
Additional paid-in capital 43,970,530us-gaap_AdditionalPaidInCapitalCommonStock 42,556,292us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost, 2,000 shares (1,950)us-gaap_TreasuryStockValue (1,950)us-gaap_TreasuryStockValue
Accumulated deficit (70,590,624)us-gaap_RetainedEarningsAccumulatedDeficit (50,806,524)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (deficit) (26,607,638)us-gaap_StockholdersEquity (8,238,724)us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 103,612,080us-gaap_LiabilitiesAndStockholdersEquity $ 90,115,321us-gaap_LiabilitiesAndStockholdersEquity