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Accrued charter revenue, current and non-current-Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Charter Revenue Current and Non-Current [Abstract]
Accrued charter revenue, net	$ (34,137)	$ (32,751)
Accrued charter revenue	456	511
Accrued charter revenue, non-current	822	1,025
Charter revenue resulting from varying charter rates	$ 35,415	$ 34,287

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- Definition

The difference between the revenue recorded and the cash received which was recognized under the straight line method in conformity with revenue recogition criteria based on specific contractual terms. It includes both current and non-current portion.

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Name:	cmre_AccruedRevenueNet
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
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- Definition

The current portion of revenue earned but not yet received, which were recognized in under the straight-line method in conformity with revenue recognition criteria based on specific contractual terms.

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- Definition

The noncurrent portion of revenue earned but not yet received, which were recognized in under the straight-line method in conformity with revenue recognition criteria based on specific contractual terms.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Any unearned revenue resulting from charter agreements providing for varying charter rates over their term, which were accounted for on a straight-line basis at their average rate.

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Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant