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Debt and Leases - Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009	May 31, 1998	Dec. 31, 2008
Debt:
2015	$ 4,482,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016	714,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Debt	5,196,000us-gaap_LongTermDebt	5,743,000us-gaap_LongTermDebt
Current portion of long-term debt	(4,482,000)us-gaap_DebtCurrent	(3,314,000)us-gaap_DebtCurrent
Long-term debt	714,000us-gaap_LongTermDebtNoncurrent	2,429,000us-gaap_LongTermDebtNoncurrent
Percent of subsidiary stock not security for financing	65.00%cmt_PercentOfSubsidiaryStockNotSecurityForFinancing
Planned capital improvements excluded from fixed charge	18,000,000cmt_DebtInstrumentPlannedCapitalImprovementsExcludedFromFixedCharge
Capex loan
Debt:
Debt	2,428,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember	4,143,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember
Stated interest rate	1.76%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember	1.77%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember
Repayment term	7 years
Debt instrument, face amount	12,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember
Mexican loan
Debt:
Debt	0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember	1,600,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember
Stated interest rate		1.73%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember
Repayment term	5 years
Debt instrument, face amount	8,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember
Industrial Development Revenue Bond
Debt:
Stated interest rate		0.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cmt_IndustrialDevelopmentRevenueBondMember
Debt instrument, face amount				7,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_IndustrialDevelopmentRevenueBondMember
Revolving line of credit
Debt:
Debt	2,768,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember	0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember
Mexican Expansion Revolving Loan
Debt:
Mexican Expansion Revolving Loan, unused borrowing capacity, mount	10,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = cmt_MexicanExpansionRevolvingLoanMember
Loans payable | Capex loan
Debt:
Debt instrument, face amount	12,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Description of variable rate basis	30 day LIBOR
Basis spread on variable rate	1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Loans payable | Mexican loan
Debt:
Description of variable rate basis			daily LIBOR
Basis spread on variable rate	1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Loans payable | Revolving line of credit
Debt:
Basis spread on variable rate	1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Loans payable | Mexican Expansion Revolving Loan
Debt:
Basis spread on variable rate	1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cmt_MexicanExpansionRevolvingLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Line of credit
Debt:
Percent of subsidiary stock not security for financing	65.00%cmt_PercentOfSubsidiaryStockNotSecurityForFinancing / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Line of credit facility, maximum borrowing capacity	18,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Description of variable rate basis	daily LIBOR
Line of credit | Capex loan
Debt:
Debt instrument, face amount	12,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_CapexLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Line of credit | Mexican loan
Debt:
Debt instrument, face amount	8,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cmt_MexicanLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Line of credit | Revolving line of credit
Debt:
Line of credit facility, maximum borrowing capacity	18,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember				8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cmt_RevolvingLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Line of credit | Letter of credit
Debt:
Debt instrument, face amount	$ 3,332,493us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember

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Debt Instrument, Planned Capital Improvements Excluded From Fixed Charge

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Long-term Debt, Maturities, Repayment Term

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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