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Basis of Presentation and General Information-Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 10 Months Ended
May. 13, 2015
$ / shares
shares
Jun. 30, 2015
Teutonic
$ / shares
shares
Mar. 31, 2015
$ / shares
shares
Jan. 21, 2014
$ / shares
shares
Mar. 27, 2012
$ / shares
shares
Jun. 30, 2015
Teutonic
$ / shares
shares
Aug. 07, 2013
$ / shares
shares
Oct. 19, 2012
$ / shares
shares
Dec. 31, 2014
Teutonic
Common Stock Par Or Stated Value Per Share   $ 0.0001 $ 0.0001     $ 0.0001      
Public offering of Series C Cumulative Redeemable Perpetual Preferred Stock [Member]                  
Preferred stock dividend rate 8.75%     8.50%          
Stock Issued During Period Shares New Issues | shares 4,000,000     4,000,000          
Common Stock Par Or Stated Value Per Share $ 0.0001     $ 0.0001          
Sale of Stock, Price Per Share $ 25     $ 25          
Follow on offering [Member]                  
Stock Issued During Period Shares New Issues | shares         7,500,000        
Common Stock Par Or Stated Value Per Share         $ 0.0001        
Sale of Stock, Price Per Share         $ 14.1        
Costamare Inc [Member]                  
Entity Incorporation State Country Name           Republic of the Marshall Islands      
Entity Incorporation Date Of Incorporation           Apr. 21, 2008      
Number of shipowning companies acquired during the entity's reorganization           53      
Date of reorganization completion           November 2008      
Date of IPO completion           November 4, 2010      
Balance of shares as at period end | shares   75,099,200       75,099,200      
Percentage of outstanding common shares owned by the Family   64.90%       64.90%      
MLP offering           On October 2, 2014, Costamare Partners LP (the “MLP”), a Marshall Islands limited partnership and a wholly owned subsidiary of the Company, filed a Registration Statement on Form F-1 with the SEC (which registration statement was subsequently amended and re-filed on October 23, 2014, November 12, 2014, January 30, 2015, June 8, 2015 and June 26, 2015) for the initial public offering of common units representing limited partnership interests (the “common units”) in the MLP. The number of common units to be offered and the price range for the offering have not yet been finally determined. The proceeds from the offering are expected to be used principally to reduce indebtedness and for general partnership purposes, with the remainder to be distributed to the Company. If the offering is completed, the Company expects to contribute to the MLP a 100% interest in the entities which own four of the Company’s existing container vessels. Following the offering, the MLP will remain a consolidated subsidiary of the Company as the Company will retain a majority of the MLP’s total equity interests and, through a subsidiary, act as its general partner. Completion of the initial public offering is subject to further authorization of the board of directors of the Company, as well as completion of the SEC review process.      
Public offering of Series B Cumulative Redeemable Perpetual Preferred Stock [Member]                  
Preferred stock dividend rate             7.625%    
Stock Issued During Period Shares New Issues | shares             2,000,000    
Common Stock Par Or Stated Value Per Share             $ 0.0001    
Sale of Stock, Price Per Share             $ 25    
Second follow-on offering [Member]                  
Stock Issued During Period Shares New Issues | shares               7,000,000  
Common Stock Par Or Stated Value Per Share               $ 0.0001  
Sale of Stock, Price Per Share               $ 14  
Fleet information [Member]                  
Number of vessels at period end   55       55     55
Carrying capacity of vessels at period end (TEU) | Teutonic   320,407       320,407     320,407
Number Subsidiaries [Member]                  
Number of subsidiaries incorporated in Marchall Islands   5       5      
Total wholly owned subsidiaries as at period end   92       92      
Common stock issued to Costamare Shipping [Member]                  
Stock Issued During Period Shares New Issues | shares   149,600 149,600