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Note 8 - Dividends Declared and Paid (Details Textual) - $ / shares | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.09 | $ 0.07
Distribution Made to Limited Partner, Distributions Declared, Per Unit (in dollars per share) | 0.09 | 0.07
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | 0.41406 | 0.41406
Series A Preferred Stock [Member] |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ 0.41406 | $ 0.41406
Preferred Stock, Dividend Rate, Percentage | 6.625% | 6.625%

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