Debt Instrument, Commitments

No definition available.

Name:	cmt_DebtInstrumentCommitments
Namespace Prefix:	cmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Percentage Of Equity Interests

+ References

No definition available.

+ Details

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Namespace Prefix:	cmt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- 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.

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- Definition

Amount of the required periodic payments including both interest and principal payments.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

No definition available.

+ Details

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- 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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Expenses paid for obtaining loans which includes expenses such as application and origination fees.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

+ References

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Narrative (Details) - USD ($)			12 Months Ended
Debt - Narrative (Details) - USD ($)	Jul. 22, 2022	Apr. 24, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 20, 2020
Debt Instrument [Line Items]
Principal amount advanced			$ 1,288,000	$ 25,913,000	$ 3,022,000
Gross debt origination fees			291,000	370,000
Long-term debt			21,519,000	22,986,000
Revolving debt			0	1,864,000
Interest rate hedging derivatives:
Debt Instrument [Line Items]
Principal amount			$ 25,000,000
Fixed interest rate			2.95%
Fair value of interest rate swap			$ 524,000
Huntington Term Loans \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	$ 104,000
Huntington Term Loans \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	156,000
Huntington Term Loans \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	208,000
FGI Term Loans [Member]
Debt Instrument [Line Items]
Long-term debt				$ 12,561,000
Write off of deferred loan costs			1,234,000
Prepayment fees			$ 348,000
Credit Agreement
Debt Instrument [Line Items]
Origination fees	402,000
Revolving Credit Facility \| Huntington Capex Loan
Debt Instrument [Line Items]
Revolving loan commitment	25,000,000
Revolving Credit Facility \| Huntington Revolving Loan
Debt Instrument [Line Items]
Principal amount	25,000,000
Principal amount advanced	$ 13,689,000
Debt term	5 years
Revolving loan commitment	$ 25,000,000
Line of Credit Facility, Remaining Borrowing Capacity	25,000,000
Revolving Credit Facility \| Wells Fargo Term Loans [Member]
Debt Instrument [Line Items]
Weighted average interest rate				4.25%
Loans Payable \| Huntington Term Loans
Debt Instrument [Line Items]
Principal amount	$ 75,000,000
Debt Instrument, Covenant, Percentage Of Equity Interests	6500.00%
Stated interest rate	0.00%		7.11%
Debt Instrument, Commitments	$ 25,000,000
Loans Payable \| Huntington Term Loans \| Huntington Loans
Debt Instrument [Line Items]
Principal amount advanced	$ 38,689,000
Loans Payable \| Leaf Capital term loan payable
Debt Instrument [Line Items]
Principal amount		$ 175,000
Stated interest rate		550.00%
Debt term		60 months
Loans Payable \| Wells Fargo Term Loans [Member]
Debt Instrument [Line Items]
Weighted average interest rate				3.77%
Revolving debt				$ 4,424,000
Current portion of long-term debt				$ 13,992,000
Loans Payable \| FGI Term Loans [Member]
Debt Instrument [Line Items]
Principal amount						$ 0.0295
Stated interest rate				8.25%
Loans Payable \| Huntington Loans
Debt Instrument [Line Items]
Stated interest rate			7.11%
Loans Payable \| Federal Funds Rate \| Huntington Term Loans
Debt Instrument [Line Items]
Basis points	50.00%
Loans Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Huntington Term Loans
Debt Instrument [Line Items]
Basis points	100.00%
Loans Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Huntington Term Loans \| Minimum
Debt Instrument [Line Items]
Basis points	2.80%
Loans Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Huntington Term Loans \| Maximum
Debt Instrument [Line Items]
Basis points	3.30%
SOFR Loans \| Huntington Term Loans
Debt Instrument [Line Items]
Stated interest rate	0.00%
SOFR Loans \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Huntington Term Loans \| Minimum
Debt Instrument [Line Items]
Basis points	1.80%
SOFR Loans \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Huntington Term Loans \| Maximum
Debt Instrument [Line Items]
Basis points	2.30%
Secured Debt \| Huntington Term Loans
Debt Instrument [Line Items]
Principal amount	$ 25,000,000
Principal amount advanced	$ 25,000,000