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Note 8 - Shareholders' Equity - Fair Value Assumptions of Stock Options (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Weighted average exercise price (in dollars per share) $ 0.54  
Risk free interest rate 4.00%  
Volatility 107.00%  
Expected term (in years) (Year) 2 years 6 months  
Minimum [Member]    
Weighted average exercise price (in dollars per share)   $ 10.35
Risk free interest rate   3.93%
Volatility   106.48%
Expected term (in years) (Year)   2 years 6 months
Maximum [Member]    
Weighted average exercise price (in dollars per share)   $ 12.6
Risk free interest rate   4.71%
Volatility   106.51%
Expected term (in years) (Year)   4 years