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Costamare Ventures Inc.-Additional information (Details) - Jun. 30, 2015 | Total
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Costamare Ventures Disclosure [Abstarct]: |
Date of entry into Agreement | May 15, 2013
Subsidiary involved into agreement | Costamare Ventures Inc.
Range of participation of Costamare Ventures | between 25% and 75%
Term of the agreement in years | 6
Number of jointly owned companies | 15
Maximum investment amount by York (in millions of USD) | up to $250 million
Minimum investment amount by Costamare Ventures (in millions of USD) | minimum of $75 million
Option for maximum investment amount by Costamare Ventures (in millions of USD) | up to $240 million
Date of Restated Framework Agreement | May 18, 2015
Restated Framework agreement, commitment period | May 18, 2020
Restated Framework agreement, termination date | May 18, 2024 or upon the occurrence of certain extraordinary events.

X
- Definition Custom Element. + References No definition available. + Details
Name: | cmre_CostamareVenturesDisclosureAbstarct
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
Name: | cmre_DateOfEntryIntoAgreement
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cmre_DateOfRestatedFrameworkAgreement
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum amount to be invested by the counterparty and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement. + References No definition available. + Details
Name: | cmre_MaximumInvestmentAmountByCounterparty
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount to be invested by the Company's wholly-owned subsidiary and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement. + References No definition available. + Details
Name: | cmre_MinimumInvestmentAmountByWhollyOwnedSubsidiary
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | cmre_NumberOfJointlyOwnedCompanies
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The optional maximum amount to be invested by the Company's wholly-owned subsidiary and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement. + References No definition available. + Details
Name: | cmre_OptionForMaximumInvestmentAmountByWhollyOwnedSubsidiary
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the range of the shareholding of the Company through Costamare Ventures, to each entity. + References No definition available. + Details
Name: | cmre_RangeOfParticipationOfCompanysWhollyOwnedSubsidiary
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cmre_RestatedFrameworkAgreementCommitmentPeriod
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cmre_RestatedFrameworkAgreementTerminationDate
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The name of the entity's wholly-owned subsidiary involved in the agreement. + References No definition available. + Details
Name: | cmre_SubsidiaryInvolvedIntoAgreement
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the maximum term of the agreement before its expiration, in years, unless the occurrence of certain extraordinary events. + References No definition available. + Details
Name: | cmre_TermOfAgreementInYears
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration