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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 |  |  |  |  |  |

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