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Quarterly Results of Operations (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly results of operations:                              
Total product sales $ 42,592,000us-gaap_SalesRevenueGoodsNet $ 43,171,000us-gaap_SalesRevenueGoodsNet $ 43,317,000us-gaap_SalesRevenueGoodsNet $ 40,664,000us-gaap_SalesRevenueGoodsNet $ 36,750,000us-gaap_SalesRevenueGoodsNet $ 32,342,000us-gaap_SalesRevenueGoodsNet $ 32,146,000us-gaap_SalesRevenueGoodsNet $ 32,858,000us-gaap_SalesRevenueGoodsNet $ 32,009,000us-gaap_SalesRevenueGoodsNet $ 32,149,000us-gaap_SalesRevenueGoodsNet $ 41,209,000us-gaap_SalesRevenueGoodsNet $ 44,331,000us-gaap_SalesRevenueGoodsNet $ 169,744,000us-gaap_SalesRevenueGoodsNet $ 134,096,000us-gaap_SalesRevenueGoodsNet $ 149,698,000us-gaap_SalesRevenueGoodsNet
Total tooling sales 1,822,000us-gaap_ContractsRevenue 420,000us-gaap_ContractsRevenue 2,807,000us-gaap_ContractsRevenue 411,000us-gaap_ContractsRevenue 898,000us-gaap_ContractsRevenue 5,092,000us-gaap_ContractsRevenue 2,535,000us-gaap_ContractsRevenue 1,504,000us-gaap_ContractsRevenue 3,687,000us-gaap_ContractsRevenue 5,532,000us-gaap_ContractsRevenue 3,335,000us-gaap_ContractsRevenue 198,000us-gaap_ContractsRevenue 5,460,000us-gaap_ContractsRevenue 10,029,000us-gaap_ContractsRevenue 12,752,000us-gaap_ContractsRevenue
Total net sales 44,414,000us-gaap_SalesRevenueNet 43,591,000us-gaap_SalesRevenueNet 46,124,000us-gaap_SalesRevenueNet 41,075,000us-gaap_SalesRevenueNet 37,648,000us-gaap_SalesRevenueNet 37,434,000us-gaap_SalesRevenueNet 34,681,000us-gaap_SalesRevenueNet 34,362,000us-gaap_SalesRevenueNet 35,696,000us-gaap_SalesRevenueNet 37,681,000us-gaap_SalesRevenueNet 44,544,000us-gaap_SalesRevenueNet 44,529,000us-gaap_SalesRevenueNet 175,204,000us-gaap_SalesRevenueNet 144,125,000us-gaap_SalesRevenueNet 162,450,000us-gaap_SalesRevenueNet
Gross margin 7,795,000us-gaap_GrossProfit 8,147,000us-gaap_GrossProfit 7,599,000us-gaap_GrossProfit 6,645,000us-gaap_GrossProfit 5,325,000us-gaap_GrossProfit 6,370,000us-gaap_GrossProfit 5,989,000us-gaap_GrossProfit 5,890,000us-gaap_GrossProfit 6,202,000us-gaap_GrossProfit 4,989,000us-gaap_GrossProfit 7,026,000us-gaap_GrossProfit 7,631,000us-gaap_GrossProfit 30,186,000us-gaap_GrossProfit 23,574,000us-gaap_GrossProfit 25,848,000us-gaap_GrossProfit
Income before interest and taxes 3,954,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 3,704,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 3,873,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 3,116,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 2,049,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 2,948,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 2,500,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 2,617,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 3,076,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 1,957,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 3,439,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 4,018,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 14,647,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 10,114,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest 12,490,000cmt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesInterestExtraordinaryItemsNoncontrollingInterest
Net income $ 2,566,000us-gaap_NetIncomeLoss $ 2,428,000us-gaap_NetIncomeLoss $ 2,520,000us-gaap_NetIncomeLoss $ 2,120,000us-gaap_NetIncomeLoss $ 1,636,000us-gaap_NetIncomeLoss $ 1,960,000us-gaap_NetIncomeLoss $ 1,589,000us-gaap_NetIncomeLoss $ 1,681,000us-gaap_NetIncomeLoss $ 2,063,000us-gaap_NetIncomeLoss $ 1,151,000us-gaap_NetIncomeLoss $ 2,341,000us-gaap_NetIncomeLoss $ 2,635,000us-gaap_NetIncomeLoss $ 9,634,000us-gaap_NetIncomeLoss $ 6,866,000us-gaap_NetIncomeLoss $ 8,190,000us-gaap_NetIncomeLoss
Net income per common share:                              
Basic (USD per share) $ 0.34us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.34us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.27us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.28us-gaap_EarningsPerShareBasic $ 0.95us-gaap_EarningsPerShareBasic $ 1.15us-gaap_EarningsPerShareBasic
Diluted (USD per share) $ 0.34us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.33us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 1.28us-gaap_EarningsPerShareDiluted $ 0.92us-gaap_EarningsPerShareDiluted $ 1.11us-gaap_EarningsPerShareDiluted