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Note 10 - Warrants (Tables)
3 Months Ended
Dec. 31, 2023
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 $337.5 per share

  1,352   337.50 

May 2024

Exercisable at $176.06 per share

  1,079   176.06 

October 2024

Exercisable at $56.25 per share

  

822

   56.25 

January 2025

Exercisable at $2.52 per share

  3,357   168.30 

December 2025

Exercisable at $168.30 per share

  3,357   168.75 

June 2026

Exercisable at $168.75 per share

  40,500   2.52 

April 2028

   50,309  $37.75  
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, 2023

  50,309  $37.75   4.07  $- 

Granted

  -   -   -   - 

Exercised

  -   -   -   - 

Forfeited

  -   -   -   - 

Outstanding at December 31, 2023

  50,309   37.75   3.82   - 
                 

Exercisable at December 31, 2023

  50,309  $37.75   -  $-