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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal - US $ 1,875,000us-gaap_CurrentFederalTaxExpenseBenefit $ 2,540,000us-gaap_CurrentFederalTaxExpenseBenefit $ 3,633,000us-gaap_CurrentFederalTaxExpenseBenefit
Federal - Foreign 453,000us-gaap_CurrentForeignTaxExpenseBenefit 171,000us-gaap_CurrentForeignTaxExpenseBenefit 227,000us-gaap_CurrentForeignTaxExpenseBenefit
State and local 42,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 44,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 96,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) 2,370,000us-gaap_CurrentIncomeTaxExpenseBenefit 2,755,000us-gaap_CurrentIncomeTaxExpenseBenefit 3,956,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 2,423,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 496,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 10,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit) (29,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (240,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local 127,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 23,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 2,521,000us-gaap_DeferredIncomeTaxExpenseBenefit 279,000us-gaap_DeferredIncomeTaxExpenseBenefit 10,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes 4,891,000us-gaap_IncomeTaxExpenseBenefit 3,034,000us-gaap_IncomeTaxExpenseBenefit 3,966,000us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income tax provision:      
Provision at federal statutory rate - US 4,938,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 3,366,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,133,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of Mexican tax law change 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (240,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Effect of foreign taxes (115,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (192,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (169,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Disqualified stock options (84,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
State and local tax expense, net of federal benefit 170,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 44,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 59,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other (18,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 56,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther (57,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 395,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 409,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 163,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Deferred tax assets 503,000us-gaap_DeferredTaxAssetsNet 1,911,000us-gaap_DeferredTaxAssetsNet  
Effective income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Components of deferred tax assets (liabilities):      
Accrued liabilities 808,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 742,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Accounts receivable 484,000cmt_DeferredTaxAssetsAccountsReceivable 400,000cmt_DeferredTaxAssetsAccountsReceivable  
Inventory 680,000us-gaap_DeferredTaxAssetsInventory 576,000us-gaap_DeferredTaxAssetsInventory  
Other, net (104,000)cmt_DeferredTaxLiabilitiesOtherCurrent (103,000)cmt_DeferredTaxLiabilitiesOtherCurrent  
Total current asset 1,868,000us-gaap_DeferredTaxAssetsNetCurrent 1,615,000us-gaap_DeferredTaxAssetsNetCurrent  
Property, plant, and equipment (4,273,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,030,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Post retirement benefits 3,419,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 2,554,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Other, net (511,000)cmt_DeferredTaxLiabilitiesOtherNoncurrent (228,000)cmt_DeferredTaxLiabilitiesOtherNoncurrent  
Deferred Tax Liabilities, Net, Noncurrent 1,365,000us-gaap_DeferredTaxLiabilitiesNoncurrent 0us-gaap_DeferredTaxLiabilitiesNoncurrent  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 0us-gaap_DeferredTaxAssetsNetNoncurrent 296,000us-gaap_DeferredTaxAssetsNetNoncurrent  
Unrecorded deferred tax liabilities, undistributed foreign earnings $ 6,204,000cmt_UnrecordedDeferredTaxLiabilitiesUndistributedForeignEarnings