| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| | | For the six-month period ended June 30, | |
| | | 2024 | | | 2025 | |
| | | EPS | | | EPS | |
| Net income from continuing operations | | $ | 201,671 | | | $ | 218,046 | |
| Net income/ (loss) from discontinued operations | | | 3,876 | | | | (27,547 | ) |
| Net income | | | 205,547 | | | | 190,499 | |
| Less: Net income attributable to non-controlling interest in subsidiaries, continuing operations | | | (1,628 | ) | | | (1,890 | ) |
| Add: Net loss attributable to non-controlling interest in subsidiaries, discontinued operations | | | 277 | | | | 213 | |
| Net income attributable to Costamare Inc. | | | 204,196 | | | | 188,822 | |
| Less: paid and accrued earnings allocated to Preferred Stock | | | (13,278 | ) | | | (10,402 | ) |
| Less: deemed dividend in redemption of Series E Preferred Stock | | | (5,446 | ) | | | - | |
| Net income available to common stockholders | | $ | 185,472 | | | $ | 178,420 | |
| Weighted average number of common shares, basic and diluted | | | 118,902,719 | | | | 120,039,623 | |
| Earnings per common share, basic and diluted, continuing operations | | $ | 1.53 | | | $ | 1.71 | |
| Earnings/ (losses) per common share, basic and diluted, discontinued operations | | | 0.03 | | | | (0.23 | ) |
| Earnings per common share, basic and diluted | | $ | 1.56 | | | $ | 1.49 | |
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