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

No definition available.

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

- Definition

The number of periodic payment installments in which the debt is to be repaid after prepayment of outstanding balance.

+ References

No definition available.

+ Details

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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

Trailing period to maintain earnings before interest, taxes, depreciation, and amortization (EBITDA) to net interest expense ratio above a certain level in the debt agreement, 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:	ctrm_
Data Type:	xbrli:durationItemType
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

Name:	ctrm_NumberOfSubsidiariesProvidingSecurityForTermLoanFacility
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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
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-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))
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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

- 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

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

- Definition

Indicates type of variable interest rate on debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

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Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

- 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
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-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

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Balance Type:
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- Details

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Data Type:	na
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Period Type:

- Details

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Balance Type:
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- Details

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- Details

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- Details

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- Details

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- Details

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Long-Term Debt, $55.0 Million Term Loan Facility (Details)					12 Months Ended
	Sep. 03, 2024 USD ($)	May 23, 2024 USD ($)	Jan. 13, 2022 Tranches	Jan. 12, 2022 USD ($) Subsidiary	Dec. 31, 2024 USD ($) Installment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Long-Term Debt [Abstract]
Repayment of loan					$ 86,866,269	$ 53,864,500	$ 24,493,000
$55.0 Million Term Loan Facility [Member]
Long-Term Debt [Abstract]
Face amount					$ 55,000,000
Number of subsidiaries providing security for term loan facility \| Subsidiary				5
Number of tranches drawn \| Tranches			5
Term of loan					5 years
Margin on variable rate					3.15%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]					us-gaap:SecuredOvernightFinancingRateSofrMember
Number of payment installments \| Installment					20
Number of payment installments following prepayments \| Installment					10
Frequency of periodic payment					quarterly
Balloon installment payable at maturity					$ 12,570,000
Trailing period to maintain EBITDA to net interest expense ratio					12 months
Repayment of loan	$ 10,600,000	$ 12,200,000
$55.0 Million Term Loan Facility [Member] \| Installments 1 to 6 [Member]
Long-Term Debt [Abstract]
Installment payment				$ 3,535,000
$55.0 Million Term Loan Facility [Member] \| Installments 7 to 12 [Member]
Long-Term Debt [Abstract]
Installment payment				1,750,000
$55.0 Million Term Loan Facility [Member] \| Installments 13 to 20 [Member]
Long-Term Debt [Abstract]
Installment payment				$ 1,340,000
$55.0 Million Term Loan Facility [Member] \| Installments 1 to 3 [Member]
Long-Term Debt [Abstract]
Installment payment		1,487,500
$55.0 Million Term Loan Facility [Member] \| Installments 4 to 9 [Member]
Long-Term Debt [Abstract]
Installment payment		1,139,000
$55.0 Million Term Loan Facility [Member] \| Installments 10 [Member]
Long-Term Debt [Abstract]
Installment payment		802,500
M/V Magic Vela Tranche of $55.0 Million Term Loan Facility [Member]
Long-Term Debt [Abstract]
Repayment of loan		$ 4,300,000