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Note 6 - Line-of-credit (Tables)
12 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Line of Credit Available Credit Limit [Table Text Block]
   

Available

 
   Line-of-Credit 

As of September 30, 2025

  $20,000,000 

October 1, 2025 through March 31, 2026

   30,000,000 

April 1, 2026 through September 30, 2026

   20,000,000 

October 1, 2026 through March 31, 2027

   30,000,000 
Schedule of Line of Credit Facilities [Table Text Block]
  

September 30

 
  

2025

  

2024

 

Borrowing limit at year-end

 $20,000,000  $20,000,000 

Outstanding balance at year-end

  11,916,760   11,166,181 

Average rate of interest during year on outstanding balances

  5.56%  6.39%

Interest rate at year-end

  5.42%  6.29%

Interest rate on unused line-of-credit

  0.25%  0.15%