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MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Concentration Risk [Line Items]      
Insurance coverage per depositor at each financial institution $ 250,000cthr_InsuranceCoveragePerDepositorAtEachFinancialInstitution    
Interest-bearing amounts on deposit in excess of FDIC insurable limits 4,890,000cthr_InterestBearingAmountsOnDepositInExcessOfFdicInsurableLimits   3,700,000cthr_InterestBearingAmountsOnDepositInExcessOfFdicInsurableLimits
Increase in allowance for doubtful accounts $ 800,000us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease    
Minimum [Member]      
Concentration Risk [Line Items]      
Period of customer payments on trade receivables 30 days    
Maximum [Member]      
Concentration Risk [Line Items]      
Period of customer payments on trade receivables 90 days    
Trade Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 33.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerMember
28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerMember
 
Trade Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerBMember
2.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerBMember
 
Trade Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerCMember
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerCMember
 
Total Gross Sales [Member]      
Concentration Risk [Line Items]      
Percentage of gross sales used as benchmark (in hundredths) 10.00%cthr_PercentageOfGrossSalesUsedAsBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
   
Total Gross Sales [Member] | Customer Concentration Risk [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerMember
23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerMember
 
Total Gross Sales [Member] | Customer Concentration Risk [Member] | Customer B [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerBMember
25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerBMember
 
Total Gross Sales [Member] | Customer Concentration Risk [Member] | Customer C [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) (3.00%)us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerCMember
20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cthr_CustomerCMember