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Oil And Gas Properties (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Oil And Gas Properties [Abstract] |  |  |
Oil and gas properties, at cost | $ 49,388 us-gaap_OilAndGasPropertyFullCostMethodGross | $ 45,101 us-gaap_OilAndGasPropertyFullCostMethodGross |
Unevaluated properties, at cost | 462 tgc_OilAndGasPropertyUnevaluatedProperties | 736 tgc_OilAndGasPropertyUnevaluatedProperties |
Accumulated depreciation, depletion and amortization | (24,437)us-gaap_OilAndGasPropertyFullCostMethodDepletion | (21,714)us-gaap_OilAndGasPropertyFullCostMethodDepletion |
Oil and gas properties, net | 25,413 us-gaap_OilAndGasPropertyFullCostMethodNet | 24,123 us-gaap_OilAndGasPropertyFullCostMethodNet |
Depletion expense | $ 2,800 us-gaap_DepletionOfOilAndGasProperties | $ 2,600 us-gaap_DepletionOfOilAndGasProperties | $ 3,000 us-gaap_DepletionOfOilAndGasProperties

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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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- Details
Name: | us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The noncash expense charged against earnings to recognize the consumption of oil and gas reserves that are part of an entities' assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_DepletionOfOilAndGasProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- 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

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- 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