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Commitments and Contingencies - Vessels Under Construction-Additional Information (Details) - Jun. 30, 2015 - New Build vessels [Member] $ in Thousands | USD ($)
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Contractual obligation on JV newbuilds | $ 122,587
Number of JV newbuilds owned 49% | 3
Number of JV newbuilds owned 25% | 2
Number of JV newbuilds owned 40% | 5

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- Definition This element represents the contractual obligation of the Company as at the period end, of newbuild vessels acquired pursuant to the Framework Agreement with York. + References No definition available. + Details
Name: | cmre_ContractualObligationOnJvNewbuilds
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the number of newbuild vessels for which Costamare Ventures has or will contribute 49% of the construction costs and has a contractual commitment as at the period end. + References No definition available. + Details
Name: | cmre_NumberOfJvNewbuildVesselsOwnedFourtyNinePercent
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the number of newbuild vessels for which Costamare Ventures has or will contribute 40% of the construction costs and has a contractual commitment as at the period end. + References No definition available. + Details
Name: | cmre_NumberOfJvNewbuildVesselsOwnedFourtyPercent
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the number of newbuild vessels for which Costamare Ventures has or will contribute 25% of the construction costs and has a contractual commitment as at the period end. + References No definition available. + Details
Name: | cmre_NumberOfJvNewbuildVesselsOwnedTwentyFivePercent
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | cmre_CommitmentsContingenciesVesselsUnderConstructionAxis=cmre_NewBuildVesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |