Income Taxes, Summary (Details) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
U.S. source gross transportation income tax	$ 113,915	$ 177,794	$ 388,669

Amount of tax expense on United States source gross transportation income for a foreign corporation.

No definition available.

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