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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2026
Dec. 31, 2025
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, oustanding (in shares) 57,346,783 43,613,800
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) 1,863 4,122
Series G Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 100,000 100,000
Preferred stock, outstanding (in shares) 500 6,190