| Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents (Note 2(e)) | 267 | 93 | 113 | 100 | 165 | 179 | 114 | 149 | 144 | 276 | 718 | 746 | 705 |
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| Restricted cash (Note 2(e)) | 5 | 9 | 14 | 14 | 7 | 7 | 6 | 7 | 5 | 9 | 10 | 11 | 18 |
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| Margin deposits (Note 22(d)) | - | - | - | - | - | - | - | - | - | - | - | 14 | 45 |
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| Accounts receivable, net (Note 3) | 2 | 16 | 2 | 1 | 1 | 1 | 6 | 7 | 8 | 21 | 27 | - | 46 |
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| Inventories (Note 6) | 9 | 11 | 12 | 11 | 11 | 10 | 11 | 11 | 10 | 21 | 28 | 61 | 58 |
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| Due from related parties (Note 3) | - | - | - | - | - | - | - | - | - | - | - | - | 7 |
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| Fair value of derivatives (Notes 22 and 23) | 0 | - | - | - | - | 0 | 4 | 1 | 0 | - | 26 | 33 | 11 |
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| Insurance claims receivable | 1 | 1 | 2 | 4 | 3 | 2 | 6 | 2 | 1 | 4 | 5 | 18 | 11 |
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| Time charter assumed (Note 14) | - | - | - | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Current portion of revenue earned, but not collected, resulting from charter agreements providing for varying annual charter rates over their terms, which were accounted for on a straight-line basis at their average rates. | - | - | - | - | - | - | - | - | - | 7 | 11 | 10 | 12 |
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| Short-term investments (Note 5) | - | - | - | - | - | - | - | - | - | - | 120 | 17 | 18 |
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| Investment in leaseback vessels (Note 12(b)) | - | - | - | - | - | - | - | - | - | - | - | 27 | 31 |
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| Net investment in sales type lease vessels, current (Note 12(c)) | - | - | - | - | - | - | - | - | - | - | - | 23 | 13 |
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| Prepayments and other assets | - | - | - | - | - | 9 | 9 | - | 9 | 9 | 11 | 62 | 67 |
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| Related to vessels held for sale. | - | - | - | - | 6 | 7 | 5 | 5 | 12 | 79 | 55 | 40 | - |
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| Total current assets | 300 | 137 | 158 | 145 | 210 | 227 | 171 | 197 | 192 | 426 | 1,015 | 1,118 | 1,040 |
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| This element includes vessels' book value net of accumulated depreciation and advances for vessel acquisitions and or under construction. | - | - | - | - | - | - | 2,207 | 2,432 | 2,451 | 3,650 | 3,667 | 3,447 | 3,387 |
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| Total fixed assets, net | 1,922 | 2,428 | 2,349 | 2,248 | 2,073 | 1,995 | 2,609 | 2,620 | - | - | - | 3,447 | 3,387 |
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| Equity method investments (Note 10) | - | 24 | 74 | 118 | 153 | 162 | 131 | 112 | 78 | 20 | 21 | 1 | - |
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| Investment in leaseback vessels, non-current (Note 12(b)) | - | - | - | - | - | - | - | - | - | - | - | 192 | 222 |
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| Accounts receivable, net, non-current (Note 3) | - | 7 | 1 | 1 | 2 | 2 | 18 | 9 | 4 | 5 | 5 | 6 | 4 |
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| Deferred charges, net (Note 8) | 34 | 30 | 29 | 29 | 20 | 15 | 26 | 22 | 28 | 32 | 55 | 73 | 72 |
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| Finance leases, right-of-use assets (Note 12(a)) | - | - | - | - | - | - | - | 188 | 199 | 191 | - | 39 | 38 |
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| Due from related parties, non-current (Note 3) | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
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| Net investment in sales type lease vessels, non-current (Note 12(c)) | - | - | - | - | - | - | - | - | - | - | - | 19 | 7 |
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| Restricted cash, non-current (Note 2(e)) | 42 | 50 | 50 | 49 | 39 | 33 | 47 | 40 | 43 | 69 | 84 | 69 | 55 |
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| Time charter assumed, non-current (Note 14) | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
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| Non-Current portion of revenue earned, but not collected, resulting from charter agreements providing for varying annual charter rates over their terms, which were accounted for on a straight-line basis at their average rates. | - | - | - | - | - | - | - | - | - | 8 | 12 | 11 | 3 |
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| Fair value of derivatives, non-current (Notes 22 and 23) | - | - | - | - | 1 | 4 | 4 | 1 | - | 3 | 38 | 29 | 21 |
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| Operating leases, right-of-use assets (Note 13) | - | - | - | - | - | - | - | - | - | - | - | 284 | 298 |
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| Total Assets | 2,311 | 2,686 | 2,715 | 2,639 | 2,558 | 2,490 | 3,051 | 3,012 | 3,011 | 4,407 | 4,896 | 5,287 | 5,149 |
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| Current portion of long-term debt, net of deferred financing costs (Note 11) | 162 | 207 | 193 | 185 | 198 | 206 | 149 | 211 | 147 | 272 | 320 | 347 | 318 |
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| Accounts Payable, Current | 6 | 6 | 6 | 4 | 4 | 6 | 9 | 6 | 8 | 19 | 18 | - | 49 |
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| Amounts due to related parties. | - | - | - | - | - | - | - | - | - | - | - | - | 7 |
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| Finance lease liability (Note 12 (a)) | - | - | - | - | - | - | - | - | - | - | - | 3 | 24 |
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| Operating lease liabilities, current portion (Note 13) | - | - | - | - | - | - | - | - | - | - | - | 161 | 205 |
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| Accrued liabilities | 9 | 14 | 19 | 15 | 11 | 11 | 18 | 19 | 18 | 27 | 52 | 40 | 32 |
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| Unearned revenue (Note 14) | - | - | - | - | 20 | 15 | 12 | 10 | 12 | 24 | 25 | 52 | 48 |
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| Fair value of derivatives (Notes 22 and 23) | 56 | 55 | 43 | 32 | 16 | 3 | - | 0 | 3 | 7 | 2 | 3 | 34 |
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| Other current liabilities | 11 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 7 | 28 |
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| Total current liabilities | 249 | 295 | 290 | 272 | 280 | 277 | 225 | 267 | 207 | 370 | 423 | 663 | 746 |
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| Long-term debt, net of current portion and deferred financing costs (Note 11) | 1,400 | 1,661 | 1,327 | 1,138 | 856 | 645 | 1,159 | 1,206 | 1,305 | 2,170 | 2,265 | 1,999 | 1,716 |
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| Finance lease liability, net of current portion (Note 12 (a)) | - | - | - | - | - | - | - | 120 | 116 | 100 | - | 24 | - |
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| Operating lease liabilities, non-current portion (Note 13) | - | - | - | - | - | - | - | - | - | - | - | 114 | 87 |
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| Fair value of derivatives, non-current portion (Notes 22 and 23) | 125 | 48 | 32 | 20 | - | - | - | 0 | 4 | 8 | 14 | 11 | 5 |
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| Unearned revenue, net of current portion (Note 14) | 17 | 25 | 29 | 27 | 16 | 11 | 5 | 8 | 30 | 34 | 35 | 27 | 15 |
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| Other non-current liabilities | - | - | - | - | - | - | - | - | - | - | - | 9 | 11 |
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| Total non-current liabilities | 1,541 | 1,734 | 1,622 | 1,403 | 1,204 | 995 | 1,469 | 1,335 | 1,455 | 2,311 | 2,313 | 2,185 | 1,835 |
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| COMMITMENTS AND CONTINGENCIES (Note 15) | - | - | - | - | - | - | - | - | - | - | - | - | - |
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| Temporary equity - Redeemable non-controlling interest in subsidiary - (Note 16) | - | - | - | - | - | - | - | - | - | - | 3 | 1 | -2 |
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| Preferred stock (Note 17) | - | - | - | - | - | - | - | - | - | - | - | - | - |
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| Common stock (Note 17) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Treasury stock (Note 17) | - | - | - | - | - | - | - | - | - | - | 60 | 120 | 120 |
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| Additional paid-in capital | 714 | 762 | 859 | 964 | 1,057 | 1,176 | 1,314 | 1,351 | 1,366 | 1,387 | 1,424 | 1,435 | 1,337 |
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| Retained earnings | -41 | -20 | 0 | 44 | 31 | 44 | 39 | 61 | -10 | 341 | 747 | 1,046 | 1,280 |
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| Accumulated other comprehensive income (Notes 22 and 24) | -153 | -85 | -56 | -45 | -14 | -1 | 5 | -1 | -8 | -2 | 46 | 21 | 17 |
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| Total Costamare Inc. stockholders' equity | 520 | 657 | 803 | 964 | 1,074 | 1,219 | 1,357 | 1,411 | 1,349 | 1,726 | 2,157 | 2,439 | 2,571 |
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| Non-controlling interest (Note 1) | - | - | - | - | - | - | - | - | - | - | - | 56 | 58 |
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| Total stockholders' equity | - | - | - | - | - | - | - | - | - | - | - | 2,439 | 2,571 |
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| Total liabilities and stockholders' equity | 2,311 | 2,686 | 2,715 | 2,639 | 2,558 | 2,490 | 3,051 | 3,012 | 3,011 | 4,407 | 4,896 | 5,287 | 5,149 |
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