v3.25.1
Note 8 - Investments in Marketable Securities (Tables)
6 Months Ended
Mar. 31, 2025
Notes Tables  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
   

March 31, 2025

   

September 30, 2024

 
   

Aggregate

fair value

   

Amortized/

Adjusted

cost basis

   

Pretax

unrealized

gains

   

Aggregate

fair value

   

Amortized/

Adjusted

cost basis

   

Pretax

unrealized

gains

 

Marketable securities

                                               

Common stocks

  $ 431,490     $ 139,094     $ 292,396     $ 358,691     $ 139,094     $ 219,597