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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
EXPENSES: |  |  |
Voyage expenses, related party | $ 3,381,564 | $ 1,671,145 | $ 29,769
General and administrative expenses, related party | 2,100,000 | 1,200,000 | 400,000
OTHER INCOME/(EXPENSES): |  |  |
Interest and finance costs, related party | $ 0 | $ 204,167 | $ 305,000

X
- Definition Costs primarily relating to commissions to related party brokers that are unique to a particular charter. + References No definition available. + Details
Name: | ctrm_VoyageExpensesRelatedParty
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of interest expense incurred on a debt or other obligation to related party. + References No definition available. + Details
Name: | us-gaap_InterestExpenseRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
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