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Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements Of Operations [Abstract] |  |  |
Revenues | $ 13,788 us-gaap_OilAndGasRevenue | $ 15,700 us-gaap_OilAndGasRevenue | $ 20,557 us-gaap_OilAndGasRevenue
Cost and expenses |  |  |
Production costs and taxes | 5,994 tgc_ProductionCostsAndTaxes | 5,524 tgc_ProductionCostsAndTaxes | 7,182 tgc_ProductionCostsAndTaxes
Depreciation, depletion, and amortization | 3,030 us-gaap_DepreciationDepletionAndAmortization | 2,912 us-gaap_DepreciationDepletionAndAmortization | 3,403 us-gaap_DepreciationDepletionAndAmortization
General and administrative | 2,707 us-gaap_GeneralAndAdministrativeExpense | 2,059 us-gaap_GeneralAndAdministrativeExpense | 2,613 us-gaap_GeneralAndAdministrativeExpense
Impairment | 2,796 us-gaap_AssetImpairmentCharges |  |
Total cost and expenses | 14,527 us-gaap_OperatingCostsAndExpenses | 10,495 us-gaap_OperatingCostsAndExpenses | 13,198 us-gaap_OperatingCostsAndExpenses
Income (loss) from operations | (739)us-gaap_OperatingIncomeLoss | 5,205 us-gaap_OperatingIncomeLoss | 7,359 us-gaap_OperatingIncomeLoss
Other income (expense) |  |  |
Net interest expense | (88)us-gaap_InterestExpense | (357)us-gaap_InterestExpense | (743)us-gaap_InterestExpense
(Loss) on derivatives |  |  | (142)us-gaap_GainLossOnOilAndGasHedgingActivity
Gain on sale of assets | 33 us-gaap_GainLossOnDispositionOfAssets | 118 us-gaap_GainLossOnDispositionOfAssets | 83 us-gaap_GainLossOnDispositionOfAssets
Total other (expense) | (55)us-gaap_NonoperatingIncomeExpense | (239)us-gaap_NonoperatingIncomeExpense | (802)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income tax | (794)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,966 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,557 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Deferred income tax expense | 12 us-gaap_DeferredIncomeTaxExpenseBenefit | (1,915)us-gaap_DeferredIncomeTaxExpenseBenefit | (2,226)us-gaap_DeferredIncomeTaxExpenseBenefit
Current income tax expense | (6)us-gaap_CurrentIncomeTaxExpenseBenefit | (95)us-gaap_CurrentIncomeTaxExpenseBenefit | (87)us-gaap_CurrentIncomeTaxExpenseBenefit
Net income (loss) from continuing operations | (788)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 2,956 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 4,244 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
(Loss) from discontinued operations, net of income tax benefit |  | (137)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (4,311)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) | $ (788)us-gaap_NetIncomeLoss | $ 2,819 us-gaap_NetIncomeLoss | $ (67)us-gaap_NetIncomeLoss
Net income (loss) per share - Basic |  |  |
Net income (loss) from continuing operations | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.07 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Net loss from discontinued operations |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss) per share - Diluted |  |  |
Net income (loss) from continuing operations | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.07 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net loss from discontinued operations |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Shares used in computing earnings per share |  |  |
Basic | 60,842,413 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,842,413 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,778,356 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 60,849,931 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 60,919,878 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 61,154,631 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Cost incurred related to the upstream oil and gas activities, such as the exploration, development, and production of crude petroleum and natural gas and all taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References No definition available. + Details
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