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Commitments And Contingencies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2017 | May 31, 2016 | May 31, 2015
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Rent expense | $ 73,000 us-gaap_OperatingLeasesRentExpenseNet | $ 92,000 us-gaap_OperatingLeasesRentExpenseNet | $ 80,000 us-gaap_OperatingLeasesRentExpenseNet |  |  |
Maximum range of possible payment | 386,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |
Denver Colorado [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Lease term | 38 months |  |  |  |  |
Number of free months in lease | 2 months |  |  |  |  |
Leases rent due per month | 2,700 tgc_OperatingLeasesRentExpensePerPeriod / us-gaap_StatementGeographicalAxis = tgc_DenverColoradoMember |  |  |  |  |
Lease due in 2015 | 48,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_StatementGeographicalAxis = tgc_DenverColoradoMember |  |  |  |  |
Lease due in 2016 | 50,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_StatementGeographicalAxis = tgc_DenverColoradoMember |  |  |  |  |
Lease due in 2017 | 21,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_StatementGeographicalAxis = tgc_DenverColoradoMember |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Leases rent due per month |  |  |  | $ 4,216.81 tgc_OperatingLeasesRentExpensePerPeriod / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 4,090.94 tgc_OperatingLeasesRentExpensePerPeriod / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 3,965.06 tgc_OperatingLeasesRentExpensePerPeriod / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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