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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
REVENUES: |  |  |
Commissions to charterers | $ 4,417,505 | $ 629,015 | $ 302,556
EXPENSES: |  |  |
Voyage expenses, related party | 1,671,145 | 29,769 | 40,471
Administration expenses, related party | 1,200,000 | 400,000 | 0
OTHER INCOME/(EXPENSES): |  |  |
Interest and finance costs, related party | $ 204,167 | $ 305,000 | $ 162,500

X
- Definition Address commissions represent discount (sales incentive) on services rendered by the Company and no identifiable benefit is received in exchange for the consideration provided to the charterer. + References No definition available. + Details
Name: | ctrm_AddressCommissions
Namespace Prefix: | ctrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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