v3.26.1
Note 10 - Share-based Compensation (Tables)
6 Months Ended
Mar. 31, 2026
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

March 31,

  

March 31,

 
  

2026

  

2025

  

2026

  

2025

 
                 

General and administrative

 $311,852  $1,618,958  $905,058  $3,623,674 

Research and development

  90,860   604,885   255,259   1,284,323 

Discontinued operations

           (10,049)

Share-based compensation

 $402,712  $2,223,843  $1,160,317  $4,897,948 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

March 31,

  

March 31,

 
  

2026

  

2025

  

2026

  

2025

 

Weighted Average Assumptions:

                

Expected volatility

     115.5%  116.6%  110.2%

Expected dividend yield

     0.0%  0.0%  0.0%

Risk-free interest rate

     4.1%  3.8%  3.6%

Expected term (in years)

     6.0   6.0   6.0 

Fair value of options granted

 $  $3.88  $2.20  $6.28 
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

  (171,742) $40.32         

Outstanding at March 31, 2026

  2,089,978  $35.68   5.81  $ 

Exercisable at March 31, 2026

  1,436,000  $49.29   4.30  $