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Share-Based Compensation (Details 1) (USD $)
3 Months Ended
Apr. 04, 2015
Apr. 08, 2013
Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share)   $ 3.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Equity Incentive Plan 1998 [Member] | Service Based Non vested Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding (in shares) 81,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
   
Shares, Vested (in shares) (81,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
   
Shares, Outstanding (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
   
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
  $ 3.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
Weighted Average Grant Date Fair Value, Vested (in dollars per share) $ 3.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedNonVestedShareAwardsMember
   
Equity Incentive Plan 1998 [Member] | Performance Based Non vested Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding (in shares) 652,999us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
   
Shares, Vested (in shares) (50,233)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
   
Shares, Forfeited (in shares) (53,939)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
   
Shares, Outstanding (in shares) 548,827us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
   
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) $ 3.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
  $ 3.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
Weighted Average Grant Date Fair Value, Vested (in dollars per share) $ 3.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember
   
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) $ 3.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedNonVestedShareAwardsMember