Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenues	$ 1,634us-gaap_OilAndGasRevenue	$ 3,505us-gaap_OilAndGasRevenue
Cost and expenses
Production costs and taxes	1,202tgc_ProductionCostsAndTaxes	1,399tgc_ProductionCostsAndTaxes
Depreciation, depletion, and amortization	732	703
General and administrative	554us-gaap_GeneralAndAdministrativeExpense	693us-gaap_GeneralAndAdministrativeExpense
Total cost and expenses	2,488us-gaap_OperatingCostsAndExpenses	2,795us-gaap_OperatingCostsAndExpenses
Net income (loss) from operations	(854)us-gaap_OperatingIncomeLoss	710us-gaap_OperatingIncomeLoss
Other income (expense)
Interest expense	(12)us-gaap_InterestExpense	(31)us-gaap_InterestExpense
Gain on sale of assets	20us-gaap_GainLossOnDispositionOfAssets	18us-gaap_GainLossOnDispositionOfAssets
Total other income (expenses)	8us-gaap_NonoperatingIncomeExpense	(13)us-gaap_NonoperatingIncomeExpense
Income (loss) from operations before income tax	(846)	697
Deferred Income tax benefit (expense)	331us-gaap_IncomeTaxExpenseBenefit	(273)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (515)us-gaap_NetIncomeLoss	$ 424us-gaap_NetIncomeLoss
Net income (loss) per share
Basic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic
Fully Diluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted
Shares used in computing earnings per share
Basic	60,842,413	60,842,413
Diluted	60,842,413	60,847,779

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.

No definition available.