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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2025
Dec. 31, 2024
Preferred stock, shares authorized (in shares) 1,000,000  
Series D Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 984,238 997,082
Preferred stock, shares outstanding (in shares) 984,238 997,082
Preferred stock, liquidation preference (in dollars per share) $ 25 $ 25
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 12,834,317 12,834,317
Common stock, shares outstanding (in shares) 12,834,317 12,834,317