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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 29, 2024
Dec. 14, 2023
Sep. 14, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Stockholders' Equity Note [Line Items]                
Preferred stock, par value per share       $ 0.01 $ 0.01     $ 0.01
Preferred stock redeemed, value             $ 5,330,000  
Series H Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate     3.50%   3.50% 3.50% 3.50%  
Preferred stock redeemed, shares     22   1,101      
Preferred stock, redemption price     $ 10,000   $ 10,000     $ 10,000
Preferred stock redeemed, value     $ 220,000   $ 11,000,000.0      
Series D Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate             4.50%  
Series I Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate       3.00%   3.00% 3.00% 3.00%
Series J Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, par value per share $ 0.01 $ 0.01            
Preferred stock, dividend rate       8.00%       8.00%
Proceeds from issuance of private placement $ 2,690,000 $ 15,270,000            
Shares issued 269 1,527