XML 20 R44.htm IDEA: XBRL DOCUMENT
v3.20.1

Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 12, 2020
Payments to Acquire Property, Plant, and Equipment |  | $ 7,460,000 | $ 5,801,000 | $ 4,259,000 |
Line of Credit [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 40,000,000 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 450.00% |  |  |
Maximum [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 450.00% |  |  |
Subsequent Event [Member] | Amended Forbearance Agreement [Member] | Additional Line of Credit [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 5,000,000
Subsequent Event [Member] | Amended Forbearance Agreement [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 25,000,000
Debt Instrument, Basis Spread on Variable Rate | 650.00% |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Amended Forbearance Agreement [Member] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 3,500,000 |  |  |  |

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cmt_AmendedForbearanceAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=cmt_AdditionalLineofCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |