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Equity Capital Structure, Description of Series B Preferred Shares (Details) - Series B Preferred Shares [Member] | 12 Months Ended
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Dec. 31, 2022 Vote shares
Preferred Shares [Abstract] |
Voting power of each preferred share in number of common shares (in shares) | shares | 100,000
Number of votes per share | Vote | 100,000

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- Definition The number of common shares each preferred share has in voting power. + References No definition available. + Details
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Namespace Prefix: | ctrm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |