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Note 13 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension Plan [Member]    
Service cost $ 81,066 $ 91,635
Interest cost 367,206 343,025
Expected return on plan assets (294,958) (308,149)
Recognized loss 79,132 79,181
Net periodic pension cost 232,446 205,692
Postemployment Retirement Benefits [Member]    
Service cost 7,599 11,475
Interest cost 153,369 155,156
Expected return on plan assets (133,311) (116,012)
Recognized loss (10,149) 0
Net periodic pension cost $ 17,508 $ 50,619