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Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (14)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (14)us-gaap_AllowanceForDoubtfulAccountsReceivable
Total accounts receivable 615us-gaap_AccountsReceivableNet 877us-gaap_AccountsReceivableNet
Revenue [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 584us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_RevenueMember
845us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_RevenueMember
Joint Interest [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 23us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_JointInterestMember
24us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_JointInterestMember
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 22us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_OtherReceivableMember
$ 22us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= tgc_OtherReceivableMember