XML 85 R67.htm IDEA: XBRL DOCUMENT v3.23.3
Note 9 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Pension Plan [Member]    
Service cost $ 366,537 $ 648,289
Interest cost 1,372,098 1,013,115
Expected return on plan assets (1,232,597) (1,831,550)
Recognized loss 316,724 146,402
Net periodic benefit cost 822,762 (23,744)
Other Postretirement Benefits Plan [Member]    
Service cost 45,897 97,802
Interest cost 620,622 443,721
Expected return on plan assets (464,046) (666,167)
Recognized loss 0 0
Net periodic benefit cost $ 202,473 $ (124,644)