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Business Combination (Details) (CPI [Member], USD $)
3 Months Ended
Mar. 31, 2015
Mar. 20, 2015
CPI [Member]
   
Business Combination, Separately Recognized Transactions [Line Items]    
Cash   $ 1,615,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed 240,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
 
Business Acquisitions, Gross Purchase Price   15,000,000cmt_BusinessAcquisitionsGrossPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Reduction in Purchase Price   488,000cmt_BusinessCombinationReductioninPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   675,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other   171,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   13,373,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill and Other Intangibles   1,057,000cmt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGoodwillandOtherIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   (2,277,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other   (102,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   $ 14,512,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cmt_CPIMember