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Note 8 - Capital Shares - Schedule of Warrants (Details) - $ / shares
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Balance, number of warrant shares (in shares) 720,909 521,718
Class of Warrant or Right, Outstanding (in shares) 609,717 720,909
Balance, warrants, weighted average exercise price (in dollars per share) $ 19.51 $ 28
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 21.74 $ 19.51
Issued, number of warrant shares (in shares)   384,496
Issued, warrants, weighted average exercise price (in dollars per share)   $ 8.75
Exercised, number of warrant shares (in shares)   (100,760)
Exercised, warrants, weighted average exercise price (in dollars per share)   $ 7.65
Expired, number of warrant shares (in shares) 111,192 (84,545)
Expired, warrants, weighted average exercise price (in dollars per share) $ 7.26 $ 37.29
Expired, number of warrant shares (in shares) 111,192 (84,545)
Expired, warrants, weighted average exercise price (in dollars per share) $ 7.26 $ 37.29
Balance, number of warrant shares (in shares) 609,717 720,909
Balance, warrants, weighted average exercise price (in dollars per share) $ 21.74 $ 19.51
Warrant One [Member]    
Class of Warrant or Right, Outstanding (in shares) 1,687  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 22.4  
Warrants and Rights Outstanding, Maturity Date Jan. 31, 2025  
Balance, number of warrant shares (in shares) 1,687  
Balance, warrants, weighted average exercise price (in dollars per share) $ 22.4  
Warrant Two [Member]    
Class of Warrant or Right, Outstanding (in shares) 173,614  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10.5  
Warrants and Rights Outstanding, Maturity Date Dec. 31, 2025  
Balance, number of warrant shares (in shares) 173,614  
Balance, warrants, weighted average exercise price (in dollars per share) $ 10.5  
Warrant Three [Member]    
Class of Warrant or Right, Outstanding (in shares) 15,627  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 56  
Warrants and Rights Outstanding, Maturity Date Feb. 28, 2026  
Balance, number of warrant shares (in shares) 15,627  
Balance, warrants, weighted average exercise price (in dollars per share) $ 56  
Warrant Four [Member]    
Class of Warrant or Right, Outstanding (in shares) 27,399  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 31.94  
Warrants and Rights Outstanding, Maturity Date Mar. 31, 2027  
Balance, number of warrant shares (in shares) 27,399  
Balance, warrants, weighted average exercise price (in dollars per share) $ 31.94  
Warrant Five [Member]    
Class of Warrant or Right, Outstanding (in shares) 391,390  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 24.64  
Warrants and Rights Outstanding, Maturity Date Sep. 30, 2027  
Balance, number of warrant shares (in shares) 391,390  
Balance, warrants, weighted average exercise price (in dollars per share) $ 24.64