XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Major Customers (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | $ 65,225,000 | $ 36,794,000 | $ 124,937,000 | $ 73,130,000
Contracts Revenue | 3,376,000 | 10,574,000 | 6,710,000 | 10,984,000
Total net sales | 68,601,000 | 47,368,000 | 131,647,000 | 84,114,000
Navistar [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | 12,866,000 | 9,919,000 | 23,817,000 | 19,175,000
Contracts Revenue | 12,000 | 60,000 | 12,000 | 78,000
Total net sales | 12,878,000 | 9,979,000 | 23,829,000 | 19,253,000
Volvo [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | 11,988,000 | 7,548,000 | 22,185,000 | 12,783,000
Contracts Revenue | 43,000 | 7,548,000 | 43,000 | 7,579,000
Total net sales | 12,031,000 | 15,096,000 | 22,228,000 | 20,362,000
Paccar [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | 8,537,000 | 6,391,000 | 15,300,000 | 11,852,000
Contracts Revenue | 2,860,000 | 2,692,000 | 6,063,000 | 2,882,000
Total net sales | 11,397,000 | 9,083,000 | 21,363,000 | 14,734,000
Yamaha [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | 8,450,000 | 0 | 14,049,000 | 0
Contracts Revenue | 0 | 0 | 0 | 0
Total net sales | 8,450,000 | 0 | 14,049,000 | 0
Other Customers [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales Revenue, Goods, Net | 23,384,000 | 12,936,000 | 49,586,000 | 29,320,000
Contracts Revenue | 461,000 | 274,000 | 592,000 | 445,000
Total net sales | $ 23,845,000 | $ 13,210,000 | $ 50,178,000 | $ 29,765,000

X
- Definition Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_ContractsRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueGoodsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_MajorCustomersAxis=cmt_NavistarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=cmt_VolvoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=cmt_PaccarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=cmt_YamahaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=cmt_OtherCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |