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Line-of-Credit and Long-term Debt - Line of Credit (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2013
Line of Credit Facility [Line Items]      
Long-term debt $ 78,060,000us-gaap_LongTermDebt 81,309,000us-gaap_LongTermDebt  
Commitment fee percentage 0.10%us-gaap_LineOfCreditFacilityCommitmentFeePercentage    
Debt instrument face amount     4,750,000us-gaap_DebtInstrumentFaceAmount
Stated interest rate     4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
Selected LIBOR rate      
Line of Credit Facility [Line Items]      
Interest rate on line of credit, variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= trc_SelectedLiborRateMember
   
LIBOR for a fixed rate term      
Line of Credit Facility [Line Items]      
Interest rate on line of credit, variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= trc_FixedTermLiborMember
   
Term Notes      
Line of Credit Facility [Line Items]      
Line of credit amount 70,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_MediumTermNotesMember
   
Weighted average interest pay rate 4.11%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_MediumTermNotesMember
   
Periodic payments, interest only period 2 years    
Term Notes | Selected LIBOR rate      
Line of Credit Facility [Line Items]      
Interest rate on line of credit, variable rate   1.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_VariableRateAxis
= trc_SelectedLiborRateMember
 
Revolving line of credit      
Line of Credit Facility [Line Items]      
Line of credit amount 30,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Line of credit outstanding balance 3,660,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
6,850,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Liquid assets 20,000,000trc_DebtCovenantComplianceLiquidAssetsMinimum
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving line of credit | Maximum      
Line of Credit Facility [Line Items]      
Debt equity ratio 0.75trc_DebtCovenantComplianceDebtEquityRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Revolving line of credit | Minimum      
Line of Credit Facility [Line Items]      
Debt service coverage ratio 1.25trc_DebtCovenantComplianceDebtServiceCoverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Revolving line of credit      
Line of Credit Facility [Line Items]      
Long-term debt 3,660,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
6,850,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Promissory note agreement      
Line of Credit Facility [Line Items]      
Long-term debt $ 4,400,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember