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Note 9 - Equity Method Investments - Companies Accounted For as Equity Method Investments (Details)	6 Months Ended
	Jun. 30, 2017
Steadman Maritime Co. [Member]
Date of establishment	Jul. 01, 2013
Vessel name or hull name	Ensenada
Participation percentage	49.00%
Marchant Maritime Co. [Member]
Date of establishment	Jul. 08, 2013
Vessel name or hull name	Padma
Participation percentage	49.00%
Horton Maritime Co. [Member]
Date of establishment	Jun. 26, 2013
Vessel name or hull name	Petalidi
Participation percentage	49.00%
Smales Maritime Co. [Member]
Date of establishment	Jun. 06, 2013
Vessel name or hull name	Elafonisos
Participation percentage	49.00%
Geyer Maritime Co. [Member]
Date of establishment	May 18, 2015
Vessel name or hull name	Arkadia
Participation percentage	49.00%
Goodway Maritime Co. [Member]
Date of establishment	Sep. 22, 2015
Vessel name or hull name	Monemvasia
Participation percentage	49.00%
Kemp Maritime Co. [Member]
Date of establishment	Jun. 06, 2013
Vessel name or hull name	Cape Akritas
Participation percentage	49.00%
Hyde Maritime Co. [Member]
Date of establishment	Jun. 06, 2013
Vessel name or hull name	Cape Tainaro
Participation percentage	49.00%
Skerrett Maritime Co. [Member]
Date of establishment	Dec. 23, 2013
Vessel name or hull name	Cape Artemisio
Participation percentage	49.00%
Ainsley Maritime Co. [Member]
Date of establishment	Jun. 25, 2013
Vessel name or hull name	Cape Kortia
Participation percentage	25.00%
Ambrose Maritime Co. [Member]
Date of establishment	Jun. 25, 2013
Vessel name or hull name	Cape Sounio
Participation percentage	25.00%
Benedict Maritime Co. [Member]
Date of establishment	Oct. 16, 2013
Vessel name or hull name	Triton
Participation percentage	40.00%
Bertrand Maritime Co. [Member]
Date of establishment	Oct. 16, 2013
Vessel name or hull name	Titan
Participation percentage	40.00%
Beardmore Maritime Co. [Member]
Date of establishment	Dec. 23, 2013
Vessel name or hull name	Talos
Participation percentage	40.00%
Schofield Maritime Co. [Member]
Date of establishment	Dec. 23, 2013
Vessel name or hull name	Taurus
Participation percentage	40.00%
Fairbank Maritime Co. [Member]
Date of establishment	Dec. 23, 2013
Vessel name or hull name	Theseus
Participation percentage	40.00%
Platt Maritime Co. [Member]
Date of establishment	May 18, 2015
Vessel name or hull name	Hull YZJ1206
Participation percentage	49.00%
Sykes Maritime Co. [Member]
Date of establishment	May 18, 2015
Vessel name or hull name	Hull YZJ1207
Participation percentage	49.00%

X

- Definition

The name of vessel or under construction hull name owned by the jointly owned companies formed pursuant to the Framework Agreement.

+ References

No definition available.

+ Details

Name:	cmre_VesselNameOrHullName
Namespace Prefix:	cmre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The dates of establishment or acquisition of the jointly owned companies formed pursuant to the Framework Agreement.

+ References

No definition available.

+ Details

Name:	cmre_YearOfEstablishmentOrAcquisition
Namespace Prefix:	cmre_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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