XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.20.2

Major Customers (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |
Number of Major Customers |  |  | 5 |
Revenues | $ 37,806,000 | $ 81,247,000 | $ 101,830,000 | $ 153,513,000
Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 35,847,000 | 75,440,000 | 97,777,000 | 146,892,000
Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,959,000 | 5,807,000 | 4,053,000 | 6,621,000
Navistar [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 7,588,000 | 17,786,000 | 18,352,000 | 32,078,000
Navistar [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 6,500,000 | 17,043,000 | 17,166,000 | 31,296,000
Navistar [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,088,000 | 743,000 | 1,186,000 | 782,000
Volvo [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 2,789,000 | 14,613,000 | 11,887,000 | 29,235,000
Volvo [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,167,000 | 14,581,000 | 9,740,000 | 29,096,000
Volvo [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 622,000 | 32,000 | 2,147,000 | 139,000
Universal Forest Products [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 9,484,000 | 9,203,000 | 18,471,000 | 15,325,000
Universal Forest Products [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 9,484,000 | 9,203,000 | 18,471,000 | 15,325,000
Universal Forest Products [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | 0 | 0 | 0
Paccar [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 3,167,000 | 13,422,000 | 11,323,000 | 25,407,000
Paccar [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 3,167,000 | 12,435,000 | 11,116,000 | 24,247,000
Paccar [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | 987,000 | 207,000 | 1,160,000
BRP [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 2,319,000 | 2,467,000 | 9,786,000 | 8,106,000
BRP [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,206,000 | 2,429,000 | 9,453,000 | 7,977,000
BRP [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 113,000 | 38,000 | 333,000 | 129,000
Other Customers [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 12,459,000 | 23,756,000 | 32,011,000 | 43,362,000
Other Customers [Member] | Product [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 12,323,000 | 19,749,000 | 31,831,000 | 38,951,000
Other Customers [Member] | Service [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 136,000 | $ 4,007,000 | $ 180,000 | $ 4,411,000

X
- Definition Number of Major Customers - The amount of customers that contain 10% of total sales + References No definition available. + Details
Name: | cmt_NumberofMajorCustomers
Namespace Prefix: | cmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | srt_MajorCustomersAxis=cmt_UniversalForestProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_MajorCustomersAxis=cmt_BRPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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