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Note 9 - Warrants (Tables)
6 Months Ended
Mar. 31, 2025
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 $1,346.40 per share

  429  $1,346.40 

December 2025

Exercisable at $1,350.00 per share

  409   1,350.00 

June 2026

Exercisable at $20.16 per share

  5,063   20.16 

April 2028

   5,901  $208.75  
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, 2024

  6,168  $233.99   3.42  $- 

Granted

  -   -   -   - 

Exercised

  -   -   -   - 

Forfeited

  (267)  1,024.38   -   - 

Outstanding at March 31, 2025

  5,901   208.75   0.35   - 
                 

Exercisable at March 31, 2025

  5,901  $208.75   -  $-