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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 9,634,000us-gaap_NetIncomeLoss $ 6,866,000us-gaap_NetIncomeLoss $ 8,190,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,023,000us-gaap_DepreciationDepletionAndAmortization 4,878,000us-gaap_DepreciationDepletionAndAmortization 4,523,000us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 2,521,000us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 279,000us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (782,000)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Mark-to-market of interest rate swaps (45,000)cmt_OtherComprehensiveIncomeDerivativeInstrumentsNetOfTaxAdjustmentToReconcileNetIncomeToCashProvidedByOperatingActivities (73,000)cmt_OtherComprehensiveIncomeDerivativeInstrumentsNetOfTaxAdjustmentToReconcileNetIncomeToCashProvidedByOperatingActivities (64,000)cmt_OtherComprehensiveIncomeDerivativeInstrumentsNetOfTaxAdjustmentToReconcileNetIncomeToCashProvidedByOperatingActivities
Share-based compensation 744,000us-gaap_ShareBasedCompensation 413,000us-gaap_ShareBasedCompensation 410,000us-gaap_ShareBasedCompensation
Loss on disposal of assets 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment 5,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on foreign currency translation and transaction 108,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized 27,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized 4,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Change in operating assets and liabilities:      
Accounts receivable (12,292,000)us-gaap_IncreaseDecreaseInAccountsReceivable (7,446,000)us-gaap_IncreaseDecreaseInAccountsReceivable 7,425,000us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (808,000)us-gaap_IncreaseDecreaseInInventories (862,000)us-gaap_IncreaseDecreaseInInventories 1,444,000us-gaap_IncreaseDecreaseInInventories
Taxes receivable (1,959,000)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 944,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable (1,271,000)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Prepaid and other assets (78,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 93,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (558,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (275,000)us-gaap_IncreaseDecreaseInAccountsPayable 2,259,000us-gaap_IncreaseDecreaseInAccountsPayable (2,099,000)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued and other liabilities 9,031,000us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities 125,000us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (2,593,000)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Post retirement benefits liability (777,000)us-gaap_IncreaseDecreaseInPostretirementObligations (591,000)us-gaap_IncreaseDecreaseInPostretirementObligations 169,000us-gaap_IncreaseDecreaseInPostretirementObligations
Net cash provided by operating activities 10,827,000us-gaap_NetCashProvidedByUsedInOperatingActivities 6,917,000us-gaap_NetCashProvidedByUsedInOperatingActivities 14,798,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Purchase of property, plant and equipment (10,679,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,332,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (8,258,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 92,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 777,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (10,679,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (9,240,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (7,481,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Gross borrowings on revolving line of credit (67,993,000)us-gaap_RepaymentsOfLinesOfCredit 0us-gaap_RepaymentsOfLinesOfCredit (47,369,000)us-gaap_RepaymentsOfLinesOfCredit
Gross borrowings on revolving line of credit 70,761,000us-gaap_ProceedsFromLinesOfCredit 0us-gaap_ProceedsFromLinesOfCredit 47,369,000us-gaap_ProceedsFromLinesOfCredit
Payment of principal on Mexican loan (1,600,000)cmt_RepaymentsOfSecuredDebtOtherLoan (1,600,000)cmt_RepaymentsOfSecuredDebtOtherLoan (1,600,000)cmt_RepaymentsOfSecuredDebtOtherLoan
Payment of principal on capex loan (1,715,000)cmt_RepaymentsOfSecuredDebtCapitalExpenseLoan (1,714,000)cmt_RepaymentsOfSecuredDebtCapitalExpenseLoan (1,714,000)cmt_RepaymentsOfSecuredDebtCapitalExpenseLoan
Payment of principal on industrial development revenue bond 0cmt_RepaymentsOfSecuredDebtIndustrialDevelopmentRevenueBond (420,000)cmt_RepaymentsOfSecuredDebtIndustrialDevelopmentRevenueBond (790,000)cmt_RepaymentsOfSecuredDebtIndustrialDevelopmentRevenueBond
Excess Tax Benefit from Share-based Compensation, Financing Activities 395,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 409,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 163,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments related to the purchase of treasury stock (278,000)cmt_PaymentsRelatedToPurchaseOfTreasuryStock (334,000)cmt_PaymentsRelatedToPurchaseOfTreasuryStock (253,000)cmt_PaymentsRelatedToPurchaseOfTreasuryStock
Proceeds from issuance of common stock 328,000us-gaap_ProceedsFromIssuanceOfCommonStock 410,000us-gaap_ProceedsFromIssuanceOfCommonStock 81,000us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash used in financing activities (102,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (3,249,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (4,113,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents 46,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,572,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,204,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 2,266,000us-gaap_CashAndCashEquivalentsAtCarryingValue 7,838,000us-gaap_CashAndCashEquivalentsAtCarryingValue 4,634,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 2,312,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,266,000us-gaap_CashAndCashEquivalentsAtCarryingValue 7,838,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for:      
Interest (net of amounts capitalized) 110,000us-gaap_InterestPaid 204,000us-gaap_InterestPaid 284,000us-gaap_InterestPaid
Income taxes 3,567,000us-gaap_IncomeTaxesPaidNet 1,296,000us-gaap_IncomeTaxesPaidNet 4,734,000us-gaap_IncomeTaxesPaidNet
Non Cash:      
Fixed asset purchases in accounts payable 557,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 709,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 241,000us-gaap_CapitalExpendituresIncurredButNotYetPaid
Commitments For Capital Expenditures In Progress $ 1,682,000cmt_CommitmentsForCapitalExpendituresInProgress $ 4,629,000cmt_CommitmentsForCapitalExpendituresInProgress