UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
EXPENSES:
Voyage expenses, related party	$ 655,431	$ 1,027,211
General and administrative expenses, related party	$ 1,500,000	$ 600,000

The aggregate total of expenses attributable to a related party for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

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