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Note 12 - Accrued Charter Revenue, Current and Non-current and Unearned Revenue, Current and Non-current (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Accrued Revenue, Net	$ 22,040	$ 27,639
Accrued Revenue Receivable	391	408
Accrued Revenue Receivable Non Current	0	185
Deferred Revenue	32,035	36,156
Amortization of Deferred Gain	20
Unearned Revenues Regarding Charter Revenues Resulting from Varying Charter Rates [Member]
Deferred Revenue	$ 22,431	$ 28,232

X

- References

No definition available.

+ Details

Name:	cmre_AccruedRevenueNet
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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.

+ References

No definition available.

+ Details

Name:	cmre_AccruedRevenueReceivable
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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.

+ References

No definition available.

+ Details

Name:	cmre_AccruedRevenueReceivableNonCurrent
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amortization charged against the deferred gain recorded during the reporting period.

+ References

No definition available.

+ Details

Name:	cmre_AmortizationOfDeferredGain
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: