v3.26.1
Note 9 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares
 9 Months Ended
Jun. 30, 2026
Sep. 30, 2025
Granted, warrants (in shares) 0  
Granted, warrant, weighted average exercise price (in dollars per share) $ 0  
Exercised, warrants (in shares) 0  
Exercised, warrant, weighted average exercise price (in dollars per share) $ 0  
Forfeited, warrants (in shares) (838)  
Forfeited, warrant, weighted average exercise price (in dollars per share) $ 1,348.16  
Exercisable, warrants (in shares) 5,063  
Exercisable, warrant, weighted average exercise price (in dollars per share) $ 119.56  
Warrants to Purchase Common Stock [Member]    
Outstanding, warrants (in shares) 5,901  
Outstanding, warrant, weighted average exercise price (in dollars per share) $ 244.06  
Outstanding, warrant, contractual term (Year) 1 year 11 months 12 days 3 years 5 months 1 day
Outstanding, warrants (in shares) 5,063  
Outstanding, warrant, weighted average exercise price (in dollars per share) $ 20.16  
Exercisable, warrants (in shares) 5,063  
Exercisable, warrant, weighted average exercise price (in dollars per share) $ 20.16