Price paid per share or per unit of warrants or rights repurchased.

No definition available.

Name:	ctrm_ClassOfWarrantOrRightRepurchasePricePerShare
Namespace Prefix:	ctrm_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of warrants or rights repurchased.

+ References

No definition available.

+ Details

Name:	ctrm_ClassOfWarrantOrRightRepurchases
Namespace Prefix:	ctrm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ctrm_April7WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Equity Capital Structure, Warrants Repurchase (Details) - USD ($)				12 Months Ended
	May 31, 2024	Apr. 22, 2024	Oct. 06, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Warrants Repurchase [Abstract]
Repurchase of warrants				$ 0	$ 1,058,481	$ 941,626
April 7 Warrants [Member]
Warrants Repurchase [Abstract]
Repurchase of warrants (in dollars per share)		$ 0.105	$ 0.105
Number of securities called by warrants (in shares)	1,008,077			25,000	25,000
Repurchase of warrants (in shares)	10,080,770		8,900,000
Repurchase of warrants	$ 1,058,481		$ 900,000