v3.26.1
Note 10 - Share-based Compensation (Tables)
9 Months Ended
Jun. 30, 2026
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

June 30,

  

June 30,

 
  

2026

  

2025

  

2026

  

2025

 
                 

General and administrative

 $451,788  $1,290,912  $1,356,846  $4,914,586 

Research and development

  126,181   378,516   381,440   1,662,839 

Discontinued operations

           (10,049)

Share-based compensation

 $577,969  $1,669,428  $1,738,286  $6,567,376 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

June 30,

  

June 30,

 
  

2026

  

2025

  

2026

  

2025

 

Weighted Average Assumptions:

                

Expected volatility

  114.7%  115.3%  115.0%  114.6%

Expected dividend yield

  0.0%  0.0%  0.0%  0.0%

Risk-free interest rate

  4.2%  4.0%  4.1%  4.0%

Expected term (in years)

  6.0   6.0   6.0   6.0 

Fair value of options granted

 $1.93  $4.32  $1.97  $4.59 
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

  2,715,100  $2.29         

Exercised

    $         

Forfeited and expired

  (185,693) $41.15         

Outstanding at June 30, 2026

  4,440,427  $17.83   7.85  $2,294,880 

Exercisable at June 30, 2026

  1,554,278  $46.04   4.40  $