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v3.22.1

Transactions with Related Parties, Castor Ships (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / d | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Management Agreements [Abstract] |  |  |
General and administration expenses, related parties | $ 1,200,000 | $ 400,000 | $ 0
Management fees | 6,744,750 | 930,500 | 212,300
Sale & purchase commission | 3,406,400 | 138,600 |
Castor Ships [Member] |  |  |
Management Agreements [Abstract] |  |  |
Management fees | 1,983,750 | 162,500 | 0
Sale & purchase commission | 3,406,400 | 138,600 | $ 0
Castor Ships [Member] | Voyage Expenses [Member] |  |  |
Management Agreements [Abstract] |  |  |
Charter hire commissions | 1,671,145 | 29,769 |
Castor Ships [Member] | Management Agreements [Member] |  |  |
Management Agreements [Abstract] |  |  |
Quarterly management fee | $ 300,000 |  |
Commission rate on charter agreements | 1.25% |  |
Commission rate on each vessel sale and purchase transaction | 1.00% |  |
Term of agreement | 5 years |  |
Renewal term of agreement | 5 years |  |
Termination fee multiplier | 4 |  |
Sale & purchase commission | $ 3,406,400 | 138,600 |
Castor Ships [Member] | Management Agreements [Member] | Management Fees to Related Party [Member] |  |  |
Management Agreements [Abstract] |  |  |
General and administration expenses, related parties | $ 1,200,000 | 400,000 |
Castor Ships [Member] | Commercial Shipmanagement Agreements [Member] |  |  |
Management Agreements [Abstract] |  |  |
Daily fee for services | $ / d | 250 |  |
Management fees | $ 1,983,750 | $ 162,500 |

X
- Definition The percentage of the gross charter hire, freight and the ballast bonus earned under a charter charged as a commission to the Company by a related party. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionCommissionRate
Namespace Prefix: | ctrm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A commission charged by a related party in connection with each vessel sale and purchase transaction. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionCommissionRateOnEachVesselSaleAndPurchaseTransaction
Namespace Prefix: | ctrm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commissions paid to a related party broker on time-charter and voyage-charter arrangements. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionCommissions
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fixed daily fee charged by a related party to provide a wide range of shipping services such as crew management, technical management, operational employment management, insurance arrangements, provisioning, bunkering, accounting services, general administration and audit support. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionFixedDailyFee
Namespace Prefix: | ctrm_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fees paid to related parties for providing a wide range of shipping services such as crew management, technical management, operational employment management, insurance arrangements, provisioning, bunkering, accounting services, general administration and audit support. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionManagementFees
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Termination fee multiplier applied to the total amount of the flat management fee and the per vessel management fee calculated on an annual basis under an agreement with a related party. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionManagementTerminationFeeMultiplier
Namespace Prefix: | ctrm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fixed quarterly fee charged by a related party to provide a shipping related administrative services. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionQuarterlyManagementFee
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of related party agreement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionRenewalTermOfAgreement
Namespace Prefix: | ctrm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of commission charged by related party for any sale or purchase of vessels for the Company. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionSaleAndPurchaseCommission
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of related party agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | ctrm_RelatedPartyTransactionTermOfAgreement
Namespace Prefix: | ctrm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ctrm_CastorShipsSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ctrm_VoyageExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=ctrm_ManagementAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ctrm_ManagementFeesToRelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=ctrm_CommercialShipmanagementAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |