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Provision for Taxes - Net Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
NOL carryover $ 21,625,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 17,465,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
AMT credit 606,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 606,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Accruals 1,020,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Unrealized loss on derivative contract   43,000teng_DeferredTaxAssetsUnrealizedLossOnDerivativeContract
Other 31,000us-gaap_DeferredTaxAssetsOther 14,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 23,282,000us-gaap_DeferredTaxAssetsGross 18,128,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation, depletion and amortization (4,884,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (3,447,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Unrealized gain on derivative contract (2,798,000)teng_DeferredTaxLiabilitiesUnrealizedGainOnDerivativeContract  
Total deferred tax liabilities (7,682,000)us-gaap_DeferredIncomeTaxLiabilities (3,447,000)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance (15,600,000)us-gaap_DeferredTaxAssetsValuationAllowance (14,681,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred taxes $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet