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LINE OF CREDIT (Details) (USD $)
0 Months Ended 3 Months Ended
Sep. 20, 2013
Jun. 25, 2014
Mar. 31, 2015
PNC Bank [Member] | Line of Credit Note [Member]      
Line of Credit Facility [Line Items]      
Revolving line of credit $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= cthr_LineOfCreditNoteMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_PncBankMember
   
Line of credit maturity date Jun. 15, 2015    
Line of credit, description of variable rate basis One-month LIBOR rate    
Line of credit, spread on variable rate (in hundredths) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= cthr_LineOfCreditNoteMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_PncBankMember
   
Basis for calculation of LIBOR rate (adjusted daily) actual / 360    
Wells Fargo [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Revolving line of credit   10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
 
Line of credit maturity date   Jun. 25, 2017  
Line of credit, description of variable rate basis     Wells Fargo’s 3-month LIBOR rate
Line of credit, spread on variable rate (in hundredths)     2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Basis for calculation of LIBOR rate (adjusted daily)     actual / 360
Legal fees   19,000us-gaap_LegalFees
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
 
Line of credit facility, sublimit for letter of credit   1,000,000cthr_LineOfCreditFacilitySublimitForLetterOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
 
Line of credit facility, sublimit for advances     5,000,000cthr_LineOfCreditFacilitySublimitForAdvances
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Percentage of advances, guaranteed by bank (in hundredths)     90.00%cthr_PercentageOfAdvancesGuaranteedByBank
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Maximum advances against inventory     3,000,000cthr_MaximumAdvancesAgainstInventory
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Minimum excess availability of inventory at all times required for advances     1,000,000cthr_MinimumExcessAvailabilityOfInventoryAtAllTimesRequiredForAdvances
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Interest rate in event of default in excess of standard rate (in hundredths)     3.00%cthr_PercentageOfInterestRateInEventOfDefault
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Prepaid advance fee for reduction in first year after closing (in hundredths)     2.00%cthr_PrepaidAdvanceFeePercentageForReductionInFirstYearAfterClosing
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Prepaid advance fee for reduction in Second year after closing (in hundredths)     1.00%cthr_PrepaidAdvanceFeePercentageForReductionInSecondYearAfterClosing
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Prepaid advance fee for reduction, thereafter (in hundredths)     0.00%cthr_PrepaidAdvanceFeePercentageForReductionAfter2YearsAfterClosing
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Number of business day within which guaranteed advances to be repaid     2 days
Maximum indebtedness to be maintained in the event of default to avoid triggering of default terms     200,000cthr_MaximumIndebtednessToBeMaintainedInEventOfDefaultToAvoidTriggeringOfDefaultTerms
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember
Advances against line of credit     $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= cthr_WellsFargoMember