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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts $ 14,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 14,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 60,842,413us-gaap_CommonStockSharesIssued 60,842,413us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 60,842,413us-gaap_CommonStockSharesOutstanding 60,842,413us-gaap_CommonStockSharesOutstanding
Related Party [Member]    
Allowance for doubtful accounts $ 159,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_RelatedPartyTransactionAxis
= tgc_RelatedPartyMember
$ 159,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_RelatedPartyTransactionAxis
= tgc_RelatedPartyMember