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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 3,196,000us-gaap_NetIncomeLoss $ 2,120,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,390,000us-gaap_DepreciationDepletionAndAmortization 1,363,000us-gaap_DepreciationDepletionAndAmortization
Interest rate swaps - Mark-to-market and amortization of losses (8,000)cmt_OtherComprehensiveIncomeDerivativeInstrumentsNetOfTaxAdjustmentToReconcileNetIncomeToCashProvidedByOperatingActivities (13,000)cmt_OtherComprehensiveIncomeDerivativeInstrumentsNetOfTaxAdjustmentToReconcileNetIncomeToCashProvidedByOperatingActivities
Share-based compensation 110,000us-gaap_ShareBasedCompensation 91,000us-gaap_ShareBasedCompensation
(Gain) loss on foreign currency translation and transaction 108,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized 13,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Change in operating assets and liabilities:    
Accounts receivable 512,000us-gaap_IncreaseDecreaseInAccountsReceivable (5,379,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (204,000)us-gaap_IncreaseDecreaseInInventories 637,000us-gaap_IncreaseDecreaseInInventories
Prepaid and other assets 1,119,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (31,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 2,456,000us-gaap_IncreaseDecreaseInAccountsPayable 2,068,000us-gaap_IncreaseDecreaseInAccountsPayable
Increase (Decrease) in Income Taxes Receivable 1,434,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 327,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Accrued and other liabilities (7,844,000)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (1,826,000)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Post retirement benefits liability (142,000)us-gaap_IncreaseDecreaseInPostretirementObligations (223,000)us-gaap_IncreaseDecreaseInPostretirementObligations
Net cash provided by operating activities 2,127,000us-gaap_NetCashProvidedByUsedInOperatingActivities (853,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,535,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,436,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Business Combination, Purchase Price Allocated (14,512,000)cmt_BusinessCombinationPurchasePriceAllocated 0cmt_BusinessCombinationPurchasePriceAllocated
Net cash used in investing activities (16,047,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,436,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Gross repayments on revolving line of credit (9,102,000)us-gaap_RepaymentsOfLinesOfCredit (6,361,000)us-gaap_RepaymentsOfLinesOfCredit
Gross borrowings on revolving line of credit 7,334,000us-gaap_ProceedsFromLinesOfCredit 11,198,000us-gaap_ProceedsFromLinesOfCredit
Payment of principal on Mexican loan 0cmt_RepaymentsOfSecuredDebtOtherLoan (1,600,000)cmt_RepaymentsOfSecuredDebtOtherLoan
Payments of principal on capex loan (428,000)cmt_RepaymentsOfSecuredDebtCapitalExpenseLoan (429,000)cmt_RepaymentsOfSecuredDebtCapitalExpenseLoan
Excess tax benefit from equity plans 3,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 223,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from issuance of common stock (19,000)us-gaap_ProceedsFromIssuanceOfCommonStock (281,000)us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash used in financing activities 12,826,000us-gaap_NetCashProvidedByUsedInFinancingActivities 3,312,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents (1,094,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (977,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 2,312,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,266,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 1,218,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,289,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for:    
Interest (net of amounts capitalized) 25,000us-gaap_InterestPaid 40,000us-gaap_InterestPaid
Income taxes 19,000us-gaap_IncomeTaxesPaidNet (6,000)us-gaap_IncomeTaxesPaidNet
Non Cash:    
Fixed asset purchases in accounts payable 73,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 1,993,000us-gaap_CapitalExpendituresIncurredButNotYetPaid
Term Loan [Member]    
Cash flows from financing activities:    
Proceeds from (Repayments of) Debt 15,500,000us-gaap_ProceedsFromRepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= cmt_TermLoanMember		 0us-gaap_ProceedsFromRepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= cmt_TermLoanMember
Repayments of Short-term Debt $ (500,000)us-gaap_RepaymentsOfShortTermDebt
/ us-gaap_DebtInstrumentAxis
= cmt_TermLoanMember		 $ 0us-gaap_RepaymentsOfShortTermDebt
/ us-gaap_DebtInstrumentAxis
= cmt_TermLoanMember