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Asset Retirement Obligation (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Retirement Obligation [Line Items] |  |  |
Asset Retirement Obligation, Beginning Balance | $ 1,780,000 us-gaap_AssetRetirementObligation | $ 2,099,000 us-gaap_AssetRetirementObligation |
Accretion expense | 114,000 us-gaap_AssetRetirementObligationAccretionExpense | 120,000 us-gaap_AssetRetirementObligationAccretionExpense | 132,000 us-gaap_AssetRetirementObligationAccretionExpense
Liabilities incurred | 46,000 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 26,000 us-gaap_AssetRetirementObligationLiabilitiesIncurred |
Liabilities settled | (70,000)tgc_AssetRetirementObligationLiabilitiesSettledNetOfPropertiesSold | (417,000)tgc_AssetRetirementObligationLiabilitiesSettledNetOfPropertiesSold |
Revisions in estimated liabilities | 138,000 us-gaap_AssetRetirementObligationRevisionOfEstimate | (48,000)us-gaap_AssetRetirementObligationRevisionOfEstimate |
Asset Retirement Obligation, Ending Balance | 2,008,000 us-gaap_AssetRetirementObligation | 1,780,000 us-gaap_AssetRetirementObligation | 2,099,000 us-gaap_AssetRetirementObligation
Decrease in asset reitrement obligation | 46,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations | 26,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations | 92,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations
Tennessee [Member] |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Decrease in asset reitrement obligation |  | $ 348,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations / us-gaap_StatementGeographicalAxis = stpr_TN |

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- Definition Asset Retirement Obligation Liabilities Settled, Net Of Properties Sold + References No definition available. + Details
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- Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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