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Note 11 - Common Stock Warrants - Outstanding Warrants (Details) - $ / shares
 9 Months Ended
Jul. 26, 2024
Sep. 30, 2024
Sep. 30, 2023
Outstanding warrants (in shares)   210,946 65,886
Outstanding warrants, weighted-average exercise price (in dollars per share)   $ 50.96 $ 269.54
Warrants granted (in shares)   10,730,589 145,056
Warrants granted, weighted average exercise price (in dollars per share)   $ 0.69 $ 45.5
Warrants exercised (in shares)   90,381 (0)
Warrants exercised, weighted-average exercise price (in dollars per share)   $ 2.5 $ 0
Warrants expired (in shares)   (14,879) 0
Warrants expired, weighted average exercise price (in dollars per share)   $ 88.87 $ 0
Warrants exercised (in shares)   (90,381) 0
Outstanding warrants (in shares)   10,836,275 [1] 210,942
Outstanding warrants, weighted-average exercise price (in dollars per share)   $ 1.41 $ 76.23
Prefunded Warrants 2024 Public Offering [Member]      
Warrants granted (in shares) 2,041,814 2,041,814  
Warrants granted, weighted average exercise price (in dollars per share)   $ 0.01  
Warrants exercised (in shares)   2,041,814  
Warrants exercised, weighted-average exercise price (in dollars per share)   $ 0.01  
Warrants exercised (in shares)   (2,041,814)  
Outstanding warrants, weighted-average exercise price (in dollars per share) $ 0.01    
[1] After giving retroactive effect to the 1-for-35 Reverse Stock Split that became effective May 30, 2024.