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Interest Rate Swaps (Details) (Rabobank, Forward Contracts, Designated as Hedging Instrument, USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 18, 2014
Dec. 19, 2013
Dec. 24, 2014
Oct. 23, 2012
Derivative [Line Items]            
Notional amount of interest rate derivatives         $ 35,000,000invest_DerivativeNotionalAmount  
Cash payment received from forward swap settlement 100,000us-gaap_PaymentsForProceedsFromHedgeFinancingActivities 400,000us-gaap_PaymentsForProceedsFromHedgeFinancingActivities        
Other comprehensive loss recognized due to change in fair value (1,124,130)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet          
Amount of ineffectiveness on forward swap 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges          
One-Month LIBOR
           
Derivative [Line Items]            
Notional amount of interest rate derivatives           80,000,000invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember
Fixed rate on interest rate swap         2.395%us-gaap_DerivativeFixedInterestRate
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember
0.9075%us-gaap_DerivativeFixedInterestRate
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember
Amount of notional amount of forward swap unwound       47,000,000ctt_InterestRateDerivativesUnwindDuringPeriod
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember
   
Cash payment received from forward swap settlement       100,000us-gaap_PaymentsForProceedsFromHedgeFinancingActivities
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember
   
Payment received for cancellation of interest rate swap     $ 200,000ctt_PaymentReceivedforCancellationofInterestRateSwap
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LeaseArrangementTypeAxis
= ctt_RabobankGroupMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForwardContractsMember
/ us-gaap_VariableRateAxis
= ctt_OneMonthLiborMember