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Vessels, net/ Advances for vessel acquisitions, Advances for Vessel Acquisitions (Details) - USD ($) | 12 Months Ended
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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