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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Plan [Member]        
Service cost $ 81,066 $ 91,635 $ 243,198 $ 274,905
Interest cost 367,206 343,025 1,101,618 1,029,075
Expected return on plan assets (294,958) (308,149) (884,874) (924,447)
Recognized loss 79,132 79,181 237,396 237,543
Net periodic pension cost 232,446 205,692 697,338 617,076
Postemployment Retirement Benefits [Member]        
Service cost 7,599 11,475 22,797 34,425
Interest cost 153,369 155,156 460,107 465,468
Expected return on plan assets (133,311) (116,012) (399,933) (348,036)
Recognized loss (10,149) 0 (30,447) 0
Net periodic pension cost $ 17,508 $ 50,619 $ 52,524 $ 151,857