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Transactions with Related Parties, Entry into Pool Agreement with V8 Pool Inc. (Details)	12 Months Ended
	Dec. 31, 2022
Transactions with Related Parties [Abstract]
Minimum age of vessels participating in pool operating Aframax tankers	15 years

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- Definition

Minimum age of vessels participating in an Aframax tanker pool, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ctrm_MinimumAgeOfVesselsParticipatingInTankerPool
Namespace Prefix:	ctrm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration