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Note 3 - Investments (Tables)
12 Months Ended
Sep. 30, 2023
Notes Tables  
Investment Holdings, Schedule of Investments [Table Text Block]
   

Cost

    Gross Unrealized Gains     Gross Unrealized Losses    

Total

 
   

(In thousands)

 

2023

                               

Mutual fund investments

  $ 4     $ 26     $ (20 )   $ 10  

Total

    4       26       (20 )     10  

2022

                               

Mutual fund investments

  $ 4     $ 24     $ (19 )   $ 9  

Total

    4       24       (19 )     9