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Equity Capital Structure, Common Shares (Details) | 12 Months Ended
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Dec. 31, 2022 Vote
Common Shares [Abstract] |
Number of votes per share | 1

X
- Definition Number of votes each outstanding common share is entitled to vote per share owned on all matters submitted to a vote of shareholders. + References No definition available. + Details
Name: | ctrm_CommonStockVotingRightsNumberOfVotes
Namespace Prefix: | ctrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration