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