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Note 8 - Dividends Declared and Paid (Details Textual) - $ / shares
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.36 $ 0.28 $ 0.28
Distribution Made to Limited Partner, Distributions Declared, Per Unit (in dollars per share) $ 0.36 $ 0.28 $ 0.28
Distributions to Common Stockholders, Percentage Ordinary Income 91.01% 77.03%  
Distributions to Common Stockholders, Percentage, Unrecaptured Section 1250 Gain 8.99%    
Distributions to Common Stockholders, Percentage Return of Capital   22.97%  
Series A Preferred Stock [Member]      
Preferred Stock, Dividends Per Share, Declared (in dollars per share) $ 1.65624 $ 1.65624  
Preferred Stock, Dividend Rate, Percentage   6.625% 6.625%
Distributions To Preferred Stockholders, Percentage Ordinary Income 91.01% 100.00%  
Distributions to Preferred Stockholders, Percentage, Unrecaptured Section 1250 Gain 8.99%