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Description Of Business And Significant Accounting Policies (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
accounts receivable | $ 877 us-gaap_AccountsReceivableNet | $ 1,285 us-gaap_AccountsReceivableNet
Allowance for doubtful accounts | (14)us-gaap_AllowanceForDoubtfulAccountsReceivable | (14)us-gaap_AllowanceForDoubtfulAccountsReceivable
Revenue [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
accounts receivable | 845 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_RevenueMember | 1,179 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_RevenueMember
Joint Interest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
accounts receivable | 24 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_JointInterestMember | 35 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_JointInterestMember
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
accounts receivable | $ 22 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_OtherReceivableMember | $ 85 us-gaap_AccountsReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = tgc_OtherReceivableMember

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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