Income Taxes, Summary (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Abstract]
U.S. source gross transportation income tax	$ 98,890	$ 113,915	$ 177,794
Foreign withholding taxes on dividend income	$ 542,765

The amount of foreign withholding taxes included in income tax expense (benefit), such as taxes withheld by foreign jurisdictions on dividend, interest, or similar income.

No definition available.

Name:	ctrm_IncomeTaxExpenseBenefitForeignWithholdingTaxes
Namespace Prefix:	ctrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration