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Significant Accounting Policies and Recent Accounting Pronouncements, Revenues Related to Voyage Charter Contracts (Details) | 12 Months Ended
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Dec. 31, 2021 PerformanceObligation
Revenues Related to Voyage Charter Contracts [Abstract] |
Number of performance obligations | 1

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- Definition The number of performance obligations when accounting for revenue from voyage charters under the provisions of ASC 606. + References No definition available. + Details
Name: | ctrm_RevenueFromContractWithCustomerNumberOfPerformanceObligations
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_RevenuePerformanceObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration