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Note 10 - Warrants (Tables)
6 Months Ended
Mar. 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 $196.88 per share

  1,143   196.88 

September 2023

Exercisable at $337.5 per share

  1,334   337.50 

May 2024

Exercisable at $176.06 per share

  1,063   176.06 

October 2024

Exercisable at $56.25 per share

  815   56.25 

January 2025

Exercisable at $168.30 per share

  3,344   168.30 

December 2025

Exercisable at $168.75 per share

  3,188   168.75 

June 2026

   10,887  $184.50  
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, 2022

  13,110  $210.60   2.30  $- 

Granted

  -   -   -   - 

Exercised

  -   -   -   - 

Forfeited

  (2,223)  337.50         

Outstanding at March 31, 2023

  10,887   184.50   2.79   - 
                 

Exercisable at March 31, 2023

  10,887  $184.50   -  $-