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Property, Plant & Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant & Equipment:
Property, plant and equipment	$ 119,933,000us-gaap_PropertyPlantAndEquipmentGross	$ 109,407,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(57,938,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(52,929,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment — net	61,995,000us-gaap_PropertyPlantAndEquipmentNet	56,478,000us-gaap_PropertyPlantAndEquipmentNet
Commitments for capital expenditures in progress recorded on balance sheet	1,682,000cmt_CommitmentsForCapitalExpendituresInProgress	4,629,000cmt_CommitmentsForCapitalExpendituresInProgress
Capital Expenditures Incurred but Not yet Paid	557,000us-gaap_CapitalExpendituresIncurredButNotYetPaid	709,000us-gaap_CapitalExpendituresIncurredButNotYetPaid	241,000us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capitalized interest expense	80,000us-gaap_InterestCostsCapitalized	63,000us-gaap_InterestCostsCapitalized
Land and land improvements
Property, Plant & Equipment:
Property, plant and equipment	5,098,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember	5,098,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember
Buildings
Property, Plant & Equipment:
Property, plant and equipment	37,143,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember	36,651,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Machinery and equipment
Property, Plant & Equipment:
Property, plant and equipment	75,905,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember	60,897,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Tools, dies and patterns
Property, Plant & Equipment:
Property, plant and equipment	808,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ToolsDiesAndMoldsMember	808,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ToolsDiesAndMoldsMember
Additions in progress
Property, Plant & Equipment:
Property, plant and equipment	$ 979,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cmt_EquipmentPurchasesInProgressMember	$ 5,953,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cmt_EquipmentPurchasesInProgressMember

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