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Oil And Gas Properties (Schedule Of Oil And Gas Properties) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Oil And Gas Properties [Abstract] |  |
Oil and gas properties | $ 5,704 | $ 5,315
Unevaluated properties |  | 106
Accumulated depreciation, depletion, and amortization | (984) | (196)
Oil and gas properties, net | $ 4,720 | $ 5,225

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- Definition Oil And Gas Property Unevaluated Properties + References No definition available. + Details
Name: | tgc_OilAndGasPropertyUnevaluatedProperties
Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Depletion of oil and gas property carried under the full cost method. + References No definition available. + Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodDepletion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Oil and gas properties, gross, carried under the full cost method. + References No definition available. + Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Oil and gas properties, net of depletion, carried under the full cost method. + References No definition available. + Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant