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Document and Entity Information - Jun. 30, 2015 - shares
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Document and Entity Information [Abstract]  
Entity Registrant Name Costamare Inc.
Entity Central Index Key 0001503584
Document Type 6-K
Document Period End Date Jun. 30, 2015
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Well Known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Preferred Stock, Shares Outstanding 10,000,000
Entity Common Stock Shares Outstanding 75,099,200
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2015