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Note 3 - Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2024
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

2024

  

2023

 
         

Beginning balance

 $1,331,000  $4,294,000 

Change in fair value of derivative liabilities

  239,000   (2,963,000)

Ending balance

 $1,570,000  $1,331,000 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Valuation Methodology

  

Significant Unobservable Input

  

2024

  

2023

          

Scenario-Based

  

Estimated change of control dates

  

March 2025 to March 2027

  

December 2024 to December 2026

   

Discount rate

  12.1% to 12.3%  14.1% to 15.1%
   

Probability of change of control

  60% to 90%  20% to 90%