Equity Capital Structure, Common Shares (Details)	12 Months Ended
Dec. 31, 2025 Vote
Common Shares [Abstract]
Number of votes per share	1

Number of votes each outstanding common share is entitled to vote per share owned on all matters submitted to a vote of shareholders.

No definition available.

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