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

No definition available.

Name:	ctrm_DebtInstrumentNumberOfPaymentInstallments
Namespace Prefix:	ctrm_
Data Type:	xbrli:integerItemType
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 ship-owning subsidiaries that entered into a senior secured term loan facility.

+ References

No definition available.

+ Details

Name:	ctrm_NumberOfShipOwningSubsidiariesEnteringIntoTermLoanFacility
Namespace Prefix:	ctrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
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+ Details

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Namespace Prefix:	us-gaap_
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

- References

No definition available.

+ Details

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

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
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-Paragraph 15
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=ctrm_SeniorSecuredTermLoanFacilityHamburgCommercialBankAGJuly2021Member
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Balance Type:
Period Type:

Long-Term Debt, $40.75 Million Term Loan Facility (Details)					12 Months Ended
	Sep. 17, 2024 USD ($)	Apr. 18, 2024 USD ($)	Jul. 20, 2023 USD ($)	Jul. 27, 2021 Tranche	Dec. 31, 2024 USD ($) Installment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 23, 2021 Subsidiary
Long-Term Debt [Abstract]
Repayment of loan					$ 86,866,269	$ 53,864,500	$ 24,493,000
$40.75 Million Term Loan Facility [Member]
Long-Term Debt [Abstract]
Number of ship-owning subsidiaries entering into term loan facility \| Subsidiary								4
Face amount					$ 40,750,000
Number of tranches drawn \| Tranche				4
Number of payment installments \| Installment					20
Frequency of periodic payment					quarterly
Installment payment					$ 1,154,000
Balloon installment payable at maturity					$ 17,700,000
Repayment of loan	$ 13,800,000	$ 7,000,000	$ 7,910,000