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Note 8 - Shareholders' Equity (Tables)
12 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

2024

  

2023

 

Weighted average exercise price

 $0.54   10.35 - 12.60 

Risk free interest rate

  4%   3.93% - 4.71% 

Volatility

  107%   106.48% - 106.51% 

Expected term (in years)

  2.5   2.5 - 4 

Dividend yield

 

None

  

None