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Manufactured Methane Facilities (Schedule Of The Manufactured Methane Facilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Methane Project [Line Items]    
Manufactured Methane facilities, at cost $ 513us-gaap_PropertyPlantAndEquipmentGross $ 558us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (313)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (311)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net 200us-gaap_PropertyPlantAndEquipmentNet 247us-gaap_PropertyPlantAndEquipmentNet
Methane Project [Member]    
Methane Project [Line Items]    
Manufactured Methane facilities, at cost 1,634us-gaap_PropertyPlantAndEquipmentGross
/ tgc_ExplorationAndProductionRevenueByTypeAxis
= tgc_MethaneProjectMember		 4,945us-gaap_PropertyPlantAndEquipmentGross
/ tgc_ExplorationAndProductionRevenueByTypeAxis
= tgc_MethaneProjectMember
Accumulated depreciation   (556)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ tgc_ExplorationAndProductionRevenueByTypeAxis
= tgc_MethaneProjectMember
Net $ 1,634us-gaap_PropertyPlantAndEquipmentNet
/ tgc_ExplorationAndProductionRevenueByTypeAxis
= tgc_MethaneProjectMember		 $ 4,389us-gaap_PropertyPlantAndEquipmentNet
/ tgc_ExplorationAndProductionRevenueByTypeAxis
= tgc_MethaneProjectMember