Vessels, net/ Advances for vessel acquisition/ Vessel held for sale, Advances for vessel acquisition (Details)	6 Months Ended
Jun. 30, 2022 USD ($)
Vessels, net/ Advances for vessel acquisition/ Vessel held for sale [Abstract]
Opening Balance	$ 2,368,165
Transfer to Vessels, net	(2,368,165)
Closing Balance	$ 0

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

No definition available.

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