Significant Accounting Policies and Recent Accounting Pronouncements, Accounts Receivable Trade, Net (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Accounts Receivable Trade, Net [Abstract]
Provision for doubtful accounts	$ 0	$ 4,823

Amount of expense for expected credit loss on accounts receivable.

No definition available.

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