Deferred Charges, net (Details)	6 Months Ended
Jun. 30, 2023 USD ($)
Deferred Charges, net [Abstract]
Balance at beginning of period	$ 5,357,816
Additions	1,112,815
Amortization	(1,038,325)
Transfer to Assets held for sale (Note 7(b))	(548,078)
Disposals	(614,014)
Balance at end of period	$ 4,270,214

Amount of additions to asset recognized from cost incurred to obtain or fulfill contract with customer.

No definition available.

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

- Definition

Amount of disposals for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

No definition available.

+ Details

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

- Definition

Transfer to assets held for sale recognized from cost incurred to obtain or fulfill contract with customer.

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration