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Discontinued Operations (Schedule Of The Amounts In Net Loss From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Discontinued Operations [Abstract] |  |  |  |  |  |
Revenues |  |  |  |  | $ 22 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 30 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Production costs and taxes |  |  |  |  | (164)tgc_DisposalGroupIncludingDiscontinuedOperationProductionCostsAndTaxes | (315)tgc_DisposalGroupIncludingDiscontinuedOperationProductionCostsAndTaxes
Depreciation, depletion, and amortization |  |  |  |  |  | (223)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
Impairment |  |  |  |  |  | (5,242)tgc_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges
Gain on sale of assets |  |  |  |  | 128 tgc_DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets |
Deferred income tax benefit |  |  |  |  | (180)tgc_DisposalGroupIncludingDiscontinuedOperationDeferredIncomeTaxBenefit | 1,419 tgc_DisposalGroupIncludingDiscontinuedOperationDeferredIncomeTaxBenefit
Current income tax benefit |  |  |  |  | 57 tgc_DisposalGroupIncludingDiscontinuedOperationCurrentIncomeTaxBenefit | 20 tgc_DisposalGroupIncludingDiscontinuedOperationCurrentIncomeTaxBenefit
Net loss from discontinued operations, net of income tax | $ (9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (54)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (33)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (41)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (137)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (4,311)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

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- Definition Disposal Group, Including Discontinued Operation, Gain (Loss) On Sale Of Assets + References No definition available. + Details
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- Details
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- Definition Amount of depreciation and amortization attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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