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Supplemental Oil And Gas Information (Schedule Of Reserve Value By Category And The Respective Present Values, Before Income Taxes, Discounted At 10% As A Percentage Of Total Proved Reserves) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reserve Quantities [Line Items] |  |  |
Total proved reserves year-end reserve report | $ 40,417 tgc_ProvedReserves | $ 47,856 tgc_ProvedReserves | $ 53,911 tgc_ProvedReserves
Proved developed producing reserves (PDP) | 32,059 tgc_ProvedDevelopedProducingReserves | 34,440 tgc_ProvedDevelopedProducingReserves | 42,626 tgc_ProvedDevelopedProducingReserves
% of PDP reserves to total proved reserves | 79.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves | 72.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves | 79.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves
Proved developed non-producing reserves | 2,956 tgc_ProvedDevelopedNonProducingReserves | 4,868 tgc_ProvedDevelopedNonProducingReserves | 3,234 tgc_ProvedDevelopedNonProducingReserves
% of PDNP reserves to total proved reserves | 7.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves | 10.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves | 6.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves
Proved undeveloped reserves (PUD) | 5,402 tgc_ProvedUndevelopedReserves | 8,548 tgc_ProvedUndevelopedReserves | 8,051 tgc_ProvedUndevelopedReserves
% of PUD reserves to total proved reserves | 14.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves | 18.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves | 15.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves
Oil [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Total proved reserves year-end reserve report | 40,417 tgc_ProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 47,856 tgc_ProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 53,906 tgc_ProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
Proved developed producing reserves (PDP) | 32,059 tgc_ProvedDevelopedProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 34,440 tgc_ProvedDevelopedProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 42,621 tgc_ProvedDevelopedProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
% of PDP reserves to total proved reserves | 79.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 72.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 79.00%tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
Proved developed non-producing reserves | 2,956 tgc_ProvedDevelopedNonProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 4,868 tgc_ProvedDevelopedNonProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 3,234 tgc_ProvedDevelopedNonProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
% of PDNP reserves to total proved reserves | 7.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 10.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 6.00%tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
Proved undeveloped reserves (PUD) | 5,402 tgc_ProvedUndevelopedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 8,548 tgc_ProvedUndevelopedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 8,051 tgc_ProvedUndevelopedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
% of PUD reserves to total proved reserves | 14.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 18.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | 15.00%tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
Gas [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Total proved reserves year-end reserve report |  |  | 5 tgc_ProvedReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember
Proved developed producing reserves (PDP) |  |  | 5 tgc_ProvedDevelopedProducingReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember
% of PDP reserves to total proved reserves |  |  |
Proved developed non-producing reserves |  |  |
% of PDNP reserves to total proved reserves |  |  |
Proved undeveloped reserves (PUD) |  |  |
% of PUD reserves to total proved reserves |  |  |

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