| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F |
| REVENUES: | | | | | | | | |
| Voyage revenue | 1,113.9 | 793.6 | 460.3 | 478.1 | 380.4 | 412.4 | 468.2 | 443.0 |
| Voyage revenue growth | 40.3% | 72.4% | -3.7% | 25.7% | -7.8% | -11.9% | 5.7% | 8000.7% |
| EXPENSES: | | | | | | | | |
| Voyage expenses | -49.1 | -13.3 | -7.4 | -5.3 | -5.8 | -2.6 | -1.9 | -2.8 |
| Voyage expenses-related parties (Note 3) | -15.4 | -11.1 | -6.5 | -5.3 | -3.2 | -3.1 | -3.5 | -3.7 |
| Vessels’ operating expenses | -269.2 | -180.0 | -117.1 | -116.1 | -110.6 | -103.8 | -105.8 | -117.2 |
| General and administrative expenses | 9.7 | 6.9 | 4.1 | 3.1 | 2.9 | 3.2 | 7.3 | 6.3 |
| General and administrative expenses – related parties (Note 3) | -9.8 | -9.9 | -6.9 | | | | | |
| Management and agency fees-related parties (Note 3) | -46.7 | -29.6 | -21.6 | | | | | |
| Amortization of dry-docking and special survey costs (Note 8) | -13.5 | -10.4 | -9.1 | -8.9 | | | | |
| Depreciation (Notes 7, 12 and 22) | 166.0 | 137.0 | 108.7 | 113.5 | 96.3 | 96.4 | 100.9 | |
| Gain / (loss) on sale of vessels, net (Note 7) | 126.3 | 45.9 | -79.1 | -19.6 | | | | |
| Loss on vessels held for sale (Note 7) | | | -7.7 | -2.5 | | | | |
| Vessels’ impairment loss (Notes 7 and 8) | -1.7 | | -31.6 | | | | | |
| Foreign exchange gains / (losses) | 3.2 | 0.0 | -0.3 | 0.0 | | | | |
| Operating income | 662.2 | 441.4 | 60.3 | 173.1 | 117.2 | 137.0 | 166.1 | 217.9 |
| Operating margin | 59.5% | 55.6% | 13.1% | 36.2% | 30.8% | 33.2% | 35.5% | |
| |
| OTHER INCOME / (EXPENSES): | | | | | | | | |
| Interest income | 6.0 | 1.6 | 1.8 | 3.3 | 3.5 | 2.6 | 1.6 | 1.4 |
| Interest and finance costs (Note 18) | -122.2 | -86.0 | -68.7 | -89.0 | -64.0 | -69.8 | -72.8 | -79.6 |
| Swaps breakage cost, net (Note 20) | | | 0.0 | | | | | |
| Income from equity method investments (Note 10) | 2.3 | 12.9 | 16.2 | 11.4 | 12.1 | 3.4 | -0.1 | -0.5 |
| Gain on sale of equity securities (Note 5) | | 60.2 | | | | | | |
| Dividend income (Note 5) | | 1.8 | | | | | | |
| Other, net | 3.7 | 4.6 | 1.2 | 0.8 | 0.4 | 0.6 | 0.6 | 0.4 |
| |
| Gain / (loss) on derivative instruments, net (Note 20) | | | | | | | | |
| Total other expenses, net | -107.6 | -6.2 | -51.5 | -74.1 | -49.9 | -64.1 | -84.4 | -74.1 |
| Net income | 554.7 | 435.1 | 8.9 | | | | | |
| Net loss attributable to the non-controlling interest (Note 15) | 0.3 | | | | | | | |
| Net income attributable to Costamare Inc. | 555.0 | 435.1 | 8.9 | 99.0 | 67.2 | 72.9 | 81.7 | 143.8 |
| Earnings allocated to Preferred Stock (Note 17) | | | 0.0 | -31.3 | -30.5 | | | -17.9 |
| Gain on retirement of Preferred Stock (Note 17) | | | 0.6 | | | | | |
| Net income / (loss) available to Common Stockholders | 523.9 | 404.1 | -21.6 | 67.7 | 36.7 | 51.8 | 60.6 | 125.9 |
| |
| Earnings / | $4.26 | $3.28 | ($0.18) | $0.59 | $0.33 | $0.52 | $0.79 | $1.68 |
| |
| Weighted average number of shares, basic and diluted (Note 17) (in shares) | 123.0 | 123.1 | 120.7 | 115.7 | 110.4 | 100.5 | 77.2 | 75.0 |