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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 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Pension Plan [Member]        
Service cost $ 81,066 $ 91,635 $ 162,132 $ 183,270
Interest cost 367,206 343,025 734,412 686,050
Expected return on plan assets (294,958) (308,149) (589,916) (616,298)
Recognized loss 79,132 79,181 158,264 158,362
Net periodic pension cost 232,446 205,692 464,892 411,384
Postemployment Retirement Benefits [Member]        
Service cost 7,599 11,475 15,198 22,950
Interest cost 153,369 155,156 306,738 310,312
Expected return on plan assets (133,311) (116,012) (266,622) (232,024)
Recognized loss (10,149) 0 (20,298) 0
Net periodic pension cost $ 17,508 $ 50,619 $ 35,016 $ 101,238