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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
CURRENT ASSETS    
Cash $ 1,585,530us-gaap_Cash $ 2,727,832us-gaap_Cash
Accounts receivable, trade 4,248,152us-gaap_AccountsReceivableNetCurrent 4,460,535us-gaap_AccountsReceivableNetCurrent
Accounts receivable, related parties 18,500us-gaap_AccountsReceivableRelatedPartiesCurrent 18,500us-gaap_AccountsReceivableRelatedPartiesCurrent
Derivative assets 5,420,309us-gaap_DerivativeAssetsCurrent  
Advance royalties 68,133teng_AdvanceRoyaltyCurrent 16,937teng_AdvanceRoyaltyCurrent
Prepaid expenses 767,233us-gaap_PrepaidExpenseCurrent 1,065,061us-gaap_PrepaidExpenseCurrent
Deferred financing costs, net of amortization of $599,971 and $1,308,817, respectively 1,051,671us-gaap_DeferredFinanceCostsCurrentNet 817,938us-gaap_DeferredFinanceCostsCurrentNet
Total current assets 13,159,528us-gaap_AssetsCurrent 9,106,803us-gaap_AssetsCurrent
OIL AND GAS PROPERTIES, USING SUCCESSFUL EFFORTS ACCOUNTING    
Proved properties 88,194,425us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod 77,961,183us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Unproved properties 5,728,196us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 15,092,783us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Pipelines 1,259,052teng_Pipelines 1,397,440teng_Pipelines
Accumulated depreciation, depletion and amortization (17,731,699)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization (14,473,069)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization
Oil and gas properties, net 77,449,974us-gaap_OilAndGasPropertySuccessfulEffortMethodNet 79,978,337us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $364,710 and $317,704, respectively 504,526us-gaap_PropertyPlantAndEquipmentNet 587,218us-gaap_PropertyPlantAndEquipmentNet
OTHER ASSETS    
Assets held for sale 14,301,375us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets  
Derivative assets 2,809,847us-gaap_DerivativeAssetsNoncurrent  
Deferred financing costs 3,155,014us-gaap_DeferredFinanceCostsNet 139,076us-gaap_DeferredFinanceCostsNet
Other assets 388,881us-gaap_OtherAssetsMiscellaneousNoncurrent 303,887us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets 20,655,117us-gaap_OtherAssetsNoncurrent 442,963us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS 111,769,145us-gaap_Assets 90,115,321us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable, trade 531,761us-gaap_AccountsPayableTradeCurrent 632,795us-gaap_AccountsPayableTradeCurrent
Accounts payable due to drilling operator 5,777,983teng_AccountsPayableDrillingOperatorCurrent 2,698,302teng_AccountsPayableDrillingOperatorCurrent
Accounts payable, related party 1,500us-gaap_AccountsPayableRelatedPartiesCurrent 1,500us-gaap_AccountsPayableRelatedPartiesCurrent
Accrued expenses 7,429,874us-gaap_AccruedLiabilitiesCurrent 5,302,816us-gaap_AccruedLiabilitiesCurrent
Environmental settlement and related costs 3,600,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent  
Revenue payable 25,019us-gaap_AccountsPayableOtherCurrent 127,106us-gaap_AccountsPayableOtherCurrent
Commodity derivative liability   58,176us-gaap_DerivativeLiabilitiesCurrent
Notes payable, current 4,402us-gaap_NotesAndLoansPayableCurrent 14,897us-gaap_NotesAndLoansPayableCurrent
Notes payable, related party   205,314us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Total current liabilities 17,370,539us-gaap_LiabilitiesCurrent 9,040,906us-gaap_LiabilitiesCurrent
LONG-TERM LIABILITIES    
Notes payable, net 109,539,647us-gaap_LongTermNotesAndLoans 89,204,102us-gaap_LongTermNotesAndLoans
Asset retirement obligations 90,928us-gaap_AssetRetirementObligationsNoncurrent 41,440us-gaap_AssetRetirementObligationsNoncurrent
Environmental settlement and related costs 3,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent  
Commodity derivative liability 716,488us-gaap_DerivativeLiabilitiesNoncurrent 67,597us-gaap_DerivativeLiabilitiesNoncurrent
Deferred revenue 62,510us-gaap_DeferredRevenue  
Total long-term liabilities 113,409,573us-gaap_LiabilitiesNoncurrent 89,313,139us-gaap_LiabilitiesNoncurrent
Total liabilities 130,780,112us-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; 14,578,467 and 13,457,978 shares issued, and 14,576,467 and 13,455,978 shares outstanding, respectively 14,578us-gaap_CommonStockValue 13,458us-gaap_CommonStockValue
Additional paid-in capital 44,323,190us-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 (63,346,785)us-gaap_RetainedEarningsAccumulatedDeficit (50,806,524)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (deficit) (19,010,967)us-gaap_StockholdersEquity (8,238,724)us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 111,769,145us-gaap_LiabilitiesAndStockholdersEquity $ 90,115,321us-gaap_LiabilitiesAndStockholdersEquity