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Commitments and Contingencies - Vessels Under Construction-Additional Information (Details) - Jun. 30, 2015 - New Build vessels [Member] $ in Thousands	USD ($)
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

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- 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

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- Details

Name:	cmre_CommitmentsContingenciesVesselsUnderConstructionAxis=cmre_NewBuildVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: