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v2.4.1.9

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Income Taxes [Abstract] |  |
Charitable contribution |  | $ 62,000 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Bad debt | 68,000 tgc_DeferredTaxAssetsBadDebts | 68,000 tgc_DeferredTaxAssetsBadDebts
Total deferred tax assets - current | 68,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 130,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net operating loss carryforwards | 7,173,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 7,723,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Oil and gas properties | (894,000)tgc_DeferredTaxAssetsOilAndGasProperties | 979,000 tgc_DeferredTaxAssetsOilAndGasProperties
Property, Plant and Equipment | 711,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | (1,562,000)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Asset retirement obligation | 786,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations | 565,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Tax credits | 202,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 196,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Miscellaneous | 95,000 us-gaap_DeferredTaxAssetsOther | 98,000 us-gaap_DeferredTaxAssetsOther
Valuation allowance | (790,000)us-gaap_DeferredTaxAssetsValuationAllowance | (790,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets - noncurrent | 7,283,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 7,209,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax asset | $ 7,351,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 7,339,000 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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