XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.23.3

Major Customers (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) customer | Sep. 30, 2022 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |
Number of major customers | customer |  |  | 5 |
Net sales | $ 86,728 | $ 101,606 | $ 283,961 | $ 290,933
Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 80,896 | 92,340 | 274,933 | 275,558
Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 5,832 | 9,266 | 9,028 | 15,375
UFP |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 4,000 | 5,099 | 23,931 | 29,642
UFP | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 4,000 | 5,099 | 23,931 | 29,642
UFP | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Navistar |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 19,038 | 16,821 | 56,237 | 47,222
Navistar | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 18,612 | 16,536 | 55,625 | 44,667
Navistar | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 426 | 285 | 612 | 2,555
Volvo |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 13,102 | 15,596 | 44,872 | 38,483
Volvo | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 13,102 | 15,468 | 44,073 | 38,268
Volvo | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 0 | 128 | 799 | 215
PACCAR |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 9,297 | 10,066 | 28,949 | 28,156
PACCAR | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 9,238 | 10,066 | 28,160 | 27,971
PACCAR | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 59 | 0 | 789 | 185
BRP |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 12,671 | 13,322 | 38,010 | 40,364
BRP | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 9,169 | 12,203 | 33,770 | 38,908
BRP | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 3,502 | 1,119 | 4,240 | 1,456
Other Customers |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 28,620 | 40,702 | 91,962 | 107,066
Other Customers | Product |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | 26,775 | 32,968 | 89,374 | 96,102
Other Customers | Tooling |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | $ 1,845 | $ 7,734 | $ 2,588 | $ 10,964

X
- Definition The amount of customers, expressed as a percent, whose sales individually consist of more than ten percent of total sales during any annual or interim reporting period in the current year. The loss of a significant portion of sales to these customers would have a material adverse effect on the business of the entity. + 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, excluding 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 -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
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_UniversalForestProductsMember
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_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: |