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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2024
Dec. 31, 2023
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) 1,000,000 890,946
Preferred stock, shares outstanding (in shares) 1,000,000 890,946
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) 12,369,645 12,265,061
Common stock, shares outstanding (in shares) 12,369,645 12,265,061