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Note 12 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Pension Plan [Member]    
Service cost $ 387,429 $ 324,265
Interest cost 1,410,406 1,468,822
Expected return on plan assets (1,503,902) (1,179,830)
Recognized loss (gain) 59,423 316,522
Net periodic benefit cost (income) 353,356 929,779
Other Postretirement Benefits Plan [Member]    
Service cost 4,376 30,398
Interest cost 507,423 613,477
Expected return on plan assets (729,708) (533,249)
Recognized loss (gain) (232,611) (40,597)
Net periodic benefit cost (income) $ (450,520) $ 70,029