v3.25.4
Note 10 - Share-based Compensation (Tables)
3 Months Ended
Dec. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

 
  

December 31,

 
  

2025

  

2024

 
         

General and administrative

 $593,206  $2,004,716 

Research and development

  164,399   679,438 

Discontinued operations

     (10,049)

Share-based compensation

 $757,605  $2,674,105 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Three Months Ended

 
  

December 31,

 
  

2025

  

2024

 

Weighted Average Assumptions:

        

Expected volatility

  116.6%  109.9%

Expected dividend yield

  0.0%  0.0%

Risk-free interest rate

  3.8%  3.6%

Expected term (in years)

  6.0   6.0 

Fair value of options granted

 $2.20  $6.44 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
      

Weighted Average

     
          

Remaining

  

Aggregate

 
  

Number of

  

Exercise Price

  

Contractual Term

  

Intrinsic

 
  

Shares

  

Per Share

  

(years)

  

Value

 
                 

Outstanding at September 30, 2025

  1,911,020  $42.18         

Granted

  350,700  $2.55         

Exercised

    $         

Forfeited and expired

  (133,574) $39.28         

Outstanding at December 31, 2025

  2,128,146  $35.83   5.95  $ 

Exercisable at December 31, 2025

  1,473,667  $49.16   4.44  $