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Vessels, net/ Advances for vessel acquisitions, Advances for Vessel Acquisitions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Vessels, net/ Advances for Vessel Acquisitions [Abstract]
Opening Balance	$ 2,368,165	$ 0
Advances for vessel acquisitions and other vessel pre-delivery costs		52,055,615
Transfer to Vessels, net	(2,368,165)	(49,687,450)
Closing Balance	$ 0	$ 2,368,165

X

- Definition

Advance amount related to vessel acquisitions.

+ References

No definition available.

+ Details

Name:	ctrm_AdvancesForVesselAcquisitions
Namespace Prefix:	ctrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of advances for vessel acquisitions and other vessel pre-delivery costs

+ References

No definition available.

+ Details

Name:	ctrm_AdvancesForVesselAcquisitionsAndOtherVesselPreDeliveryCosts
Namespace Prefix:	ctrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of advances for vessel acquisitions and other vessel pre-delivery costs transfer to Vessels net during the period.

+ References

No definition available.

+ Details

Name:	ctrm_AdvancesTransferToVesselsNet
Namespace Prefix:	ctrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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