The number of periodic payment installments in which the debt is to be repaid.

No definition available.

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Namespace Prefix:	ctrm_
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Balance Type:	na
Period Type:	duration

- Definition

The number of tranches in which the debt instrument was drawn down.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of the Company's subsidiaries that provided security for a senior secured term loan facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctrm_
Data Type:	xbrli:integerItemType
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

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+ Details

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

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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Period Type:	duration

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Long-Term Debt, $22.5 Million Term Loan Facility (Details)			12 Months Ended
	Dec. 07, 2022 USD ($)	Nov. 28, 2022 USD ($)	Dec. 31, 2023 USD ($) Tranches Installment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 22, 2022 Subsidiary
Debt Instruments [Abstract]
Proceeds from debt			$ 0	$ 77,500,000	$ 79,190,000
22.5 Million Term Loan Facility [Member]
Debt Instruments [Abstract]
Face amount			$ 22,500,000	$ 22,500,000
Number of subsidiaries providing security for term loan facility \| Subsidiary						2
Number of tranches drawn \| Tranches			2
Proceeds from debt	$ 11,250,000	$ 11,250,000
Term of loan			5 years
Number of payment installments \| Installment			60
Frequency of periodic payment			monthly
Balloon installment payable at maturity			$ 1,425,000
22.5 Million Term Loan Facility [Member] \| SOFR [Member]
Debt Instruments [Abstract]
Margin on variable rate			3.875%
22.5 Million Term Loan Facility [Member] \| Installments 1 to 9 [Member]
Debt Instruments [Abstract]
Installment payment			$ 250,000
22.5 Million Term Loan Facility [Member] \| Installments 10 to 12 [Member]
Debt Instruments [Abstract]
Installment payment			175,000
22.5 Million Term Loan Facility [Member] \| Installments 13 to 59 [Member]
Debt Instruments [Abstract]
Installment payment			$ 150,000