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Note 10 - Warrants (Tables)
12 Months Ended
Sep. 30, 2024
Common Stock Purchase Warrants [Member]  
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number of shares

  

Weighted-average exercise price

 

Expiration

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 $168.30 per share

  3,357   168.30 

December 2025

Exercisable at $168.75 per share

  3,199   168.75 

June 2026

Exercisable at $2.52 per share

  40,500   2.52 

April 2028

   48,957  $37.75  
Equity Classified Warrants [Member]  
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number of shares

  

Weighted-average exercise price

  

Weighted-average remaining contractual term (in years)

  

Aggregate intrinsic value (in thousands)

 

Outstanding at September 30, 2022

  13,204  $210.45   2.30  $- 

Granted

  40,500   2.52   -     

Exercised

  -   -         

Forfeited

  (3,395)  242.55         

Outstanding at September 30, 2023

  50,309   37.75   2.30   - 

Granted

  -   -   -     

Exercised

  -   -         

Forfeited

  (1,352)  337.50         

Outstanding at September 30, 2024

  48,957   337.50   4.07   - 
                 

Exercisable at September 30, 2024

  48,957  $29.48   -  $-