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Description Of Business And Significant Accounting Policies (Reconciliations Of The Numerators And Denominators Of Our Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ (2,014)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 425 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 377 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 424 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 638 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 535 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 805 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 978 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (788)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 2,956 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 4,244 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net loss from discontinued operations |  |  |  |  | (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
Weighted average shares - basic |  |  |  |  |  |  |  |  | 60,842,413 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,842,413 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,778,356 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilution effect of share-based compensation, treasury method |  |  |  |  |  |  |  |  | $ 7,518 tgc_DilutionEffectOfShareBasedCompensationTreasuryMethod | $ 77,465 tgc_DilutionEffectOfShareBasedCompensationTreasuryMethod | $ 376,275 tgc_DilutionEffectOfShareBasedCompensationTreasuryMethod
Weighted average shares - dilutive |  |  |  |  |  |  |  |  | 60,849,931 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 60,919,878 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 61,154,631 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Continuing Operations |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.07 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued Operations |  |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare

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- Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. + References No definition available. + 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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