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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2025
Dec. 31, 2024
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 25,000,000 25,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, outstanding (in shares) 21,802,649 9,661,664
Series F Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 35,000 35,000
Preferred stock, outstanding (in shares) 2,675 5,935