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Long-Term Debt (Schedule of Long-term Debt Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Revolving credit facility, with interest only payment until maturity $ 734tgc_NotesPayableInterestOnlyPaymentsUntilMaturity $ 3,257tgc_NotesPayableInterestOnlyPaymentsUntilMaturity
Installment notes bearing interest at the rate of 5.5% to 8.25% per annum collateralized by vehicles with monthly payments including interest, insurance and maintenance of approximately $10 155us-gaap_SecuredDebtOther 200us-gaap_SecuredDebtOther
Total long-term debt 889us-gaap_LongTermDebt 3,457us-gaap_LongTermDebt
Less current maturities (65)us-gaap_LongTermDebtCurrent (82)us-gaap_LongTermDebtCurrent
Long-term debt, less current maturities 824us-gaap_LongTermDebtNoncurrent 3,375us-gaap_LongTermDebtNoncurrent
Debt Instrument, Periodic Payments Including Insurance And Maintenance $ 10tgc_DebtInstrumentPeriodicPaymentsIncludingInsuranceAndMaintenance  
Maximum [Member]    
Line of Credit Facility [Line Items]    
Interest rate per annum 8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Interest rate per annum 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember