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Note 8 - Shareholders' Equity (Tables)
3 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

December 31,

  

December 31,

 
  

2022

  

2021

 

Weighted average exercise price

 

0.233 -0.2525

  $3.91 

Risk free interest rate

  3.93% - 4.71%   0.16% - 0.85% 

Volatility

  

106.51%

   100.72% - 105.43% 

Expected term (in years)

  2.5 - 4   2.5 - 6.2 

Dividend yield

 

None

  

None