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Note 7 - Deferred Charges, Net (Details Textual)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Number Vessels Underwent DD During Period	3	6

X

- Definition

The number of vessels underwent dry-docking (DD) during the reporting period.

+ References

No definition available.

+ Details

Name:	cmre_NumberVesselsUnderwentDdDuringPeriod
Namespace Prefix:	cmre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration