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Share-Based Compensation (Details Textual) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Apr. 08, 2013
Apr. 04, 2015
Mar. 29, 2014
Mar. 10, 2014
Apr. 04, 2015
Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense   $ 301,000us-gaap_AllocatedShareBasedCompensationExpense $ 174,000us-gaap_AllocatedShareBasedCompensationExpense      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 3.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod          
Earnings Before Income Tax And Dividends 14,000,000crtn_EarningsBeforeIncomeTaxAndDividends          
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   15,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense        
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense   25,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_EmployeeStockOptionMember
5,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_EmployeeStockOptionMember
     
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           78,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_EmployeeStockOptionMember
Service Based Non vested Share Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense   53,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedRestrictedStockMember
17,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedRestrictedStockMember
     
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options           54,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= crtn_ServiceBasedRestrictedStockMember
Performance Based Non vested Share Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense   216,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
150,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
     
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   18 months        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance       $ 3.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
   
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   1,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
    1,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
   
Earnings Before Income Tax And Dividends       10,500,000crtn_EarningsBeforeIncomeTaxAndDividends
/ us-gaap_PlanNameAxis
= crtn_PerformanceBasedRestrictedStockMember
   
Equity Incentive Plan 1998 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 51,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
    $ 51,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
 
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   21 months        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     70,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Increases Decreases in Period         500,000crtn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsIncreasesDecreasesInPeriod
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
 
Cumulative Number Of Shares Of Common Stock Available For Issuance Before Amendment   2,305,659crtn_CumulativeNumberOfSharesOfCommonStockAvailableForIssuanceBeforeAmendment
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
    2,305,659crtn_CumulativeNumberOfSharesOfCommonStockAvailableForIssuanceBeforeAmendment
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
 
Cumulative Number Of Shares Of Common Stock Available For Issuance After Amendment   2,805,659crtn_CumulativeNumberOfSharesOfCommonStockAvailableForIssuanceAfterAmendment
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member
    2,805,659crtn_CumulativeNumberOfSharesOfCommonStockAvailableForIssuanceAfterAmendment
/ us-gaap_AwardTypeAxis
= crtn_EquityIncentivePlan1998Member