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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2025
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Nine Months Ended

 
  

June 30,

 
  

2025

  

2024

 
         

Beginning balance

 $1,570,000  $1,331,000 

Change in fair value of derivative liabilities

  3,138,316   (102,000)

Extinguishments

  (4,708,316)   

Ending balance

 $  $1,229,000 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Valuation Methodology

 

Significant Unobservable Input

 

December 30, 2024

  

September 30, 2024

 
           

Scenario-Based

 

Estimated change of control dates

 

December 2024

  

March 2025 to March 2027

 
  

Discount rate

  N/A   12.1% to 12.3% 
  

Probability of change of control

  100%  60% to 90%