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Note 10 - Warrants (Tables)
12 Months Ended
Sep. 30, 2022
Common Stock Purchase Warrants [Member]  
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
      

Weighted-average

  
  

Number of shares

  

exercise price

 

Expiration

Exercisable at $7.50 per share

  100,000   7.50 

October 2022

Exercisable at $4.375 per share

  51,429   4.375 

September 2023

Exercisable at $7.50 per share

  60,000   7.50 

May 2024

Exercisable at $3.9125 per share

  47,822   3.9125 

October 2024

Exercisable at $1.25 per share

  36,682   1.25 

January 2025

Exercisable at $3.74 per share

  150,502   3.74 

December 2025

Exercisable at $3.75 per share

  143,482   3.75 

June 2026

   589,917  $4.68  
Equity Classified Warrants [Member]  
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
          

Weighted-average

     
          

remaining

  

Aggregate

 
      

Weighted-average

  

contractual term

  

intrinsic value

 
  

Number of shares

  

exercise price

  

(in years)

  

(in thousands)

 

Outstanding at September 30, 2020

  914,184  $3.88   3.23  $- 

Granted

  293,984   3.75       - 

Exercised

  (323,444)  1.25         

Forfeited

  (224,307)  5.39         

Outstanding at September 30, 2021

  660,417   4.60   3.05   - 

Granted

  -   -       - 

Exercised

  -   -         

Forfeited

  (70,500)  4.00         

Outstanding at September 30, 2022

  589,917   4.68   2.30   - 
                 

Exercisable at September 30, 2022

  589,917  $4.68   -  $-