Note 9 - Costamare Ventures Inc. (Details Textual)	12 Months Ended
Dec. 31, 2021	Nov. 12, 2018
Participation of Company's Wholly Owned Subsidiary	49.00%
Number of Jointly Owned Companies	6	5

The number of jointly owned companies formed pursuant to the Framework Agreement with York, that the Company holds a percentage of their capital stock as at the end of the reporting period.

No definition available.

Name:	cmre_NumberOfJointlyOwnedCompanies
Namespace Prefix:	cmre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant