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Note 7 - Stockholders' Equity - Schedule of Dividends (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 22, 2025
Deemed dividends on Series F Preferred Stock and warrants and Series G Preferred Stock $ 1,349,483 $ 1,056,332  
Series F Warrants [Member]      
Warrants, triggered (in shares) 4,752,651 593,247  
Warrants, exercise price (in dollars per share) $ 0.8526   $ 0.9615
Warrant deemed dividend $ 57,792 $ 79,695  
Series F Preferred Stock and Series F Warrants After Modification [Member]      
Deemed dividends on Series F Preferred Stock and warrants and Series G Preferred Stock $ 1,349,483 $ 1,056,332  
Minimum [Member] | Series F Warrants [Member]      
Warrants, exercise price (in dollars per share)   $ 2.22  
Maximum [Member] | Series F Warrants [Member]      
Warrants, exercise price (in dollars per share)   5.25  
After Round Down Trigger [Member] | Series F Warrants [Member]      
Convertible price (in dollars per share)   $ 1.2  
Warrants, exercise price (in dollars per share) $ 0.8526    
Series F Convertible Preferred Stock [Member]      
Preferred stock, triggered (in shares) 10,324,493 5,025  
Convertible price (in dollars per share)     $ 0.9615
Preferred stock deemed dividend $ 1,291,691 $ 976,637  
Series F Convertible Preferred Stock [Member] | Minimum [Member]      
Convertible price (in dollars per share)   $ 2.22  
Series F Convertible Preferred Stock [Member] | Maximum [Member]      
Convertible price (in dollars per share)   5.25  
Series F Convertible Preferred Stock [Member] | After Round Down Trigger [Member]      
Convertible price (in dollars per share) $ 0.8526 $ 1.2