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Note 15 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Plan [Member]        
Service cost $ 96,858 $ 81,066 $ 290,574 $ 243,198
Interest cost 352,602 367,206 1,057,806 1,101,618
Expected return on plan assets (375,976) (294,958) (1,127,928) (884,874)
Recognized loss 14,857 79,132 44,571 237,396
Net periodic pension cost 88,341 232,446 265,023 697,338
Postemployment Retirement Benefits [Member]        
Service cost 1,095 7,599 3,285 22,797
Interest cost 126,856 153,369 380,568 460,107
Expected return on plan assets (182,430) (133,311) (547,290) (399,933)
Recognized loss (58,153) (10,149) (174,459) (30,447)
Net periodic pension cost $ (112,632) $ 17,508 $ (337,896) $ 52,524