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Note 9 - Warrants (Tables)
3 Months Ended
Dec. 31, 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 $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

   47,878  $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, 2024

  48,957  $29.48   3.42  $- 

Granted

  -   -   -   - 

Exercised

  -   -   -   - 

Forfeited

  (1,079)  176.06   -   - 

Outstanding at December 31, 2024

  47,878   26.17   2.98   - 
                 

Exercisable at December 31, 2024

  47,878  $26.17   -  $-