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Note 11 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Plan [Member]    
Service cost $ 162,072 $ 183,570
Interest cost 253,279 243,785
Expected return on plan assets (457,888) (503,936)
Recognized loss 36,600 125,535
Net periodic pension cost (5,937) 48,954
Other Postretirement Benefits Plan [Member]    
Service cost 24,450 35,172
Interest cost 110,930 107,623
Expected return on plan assets (166,541) (149,122)
Recognized loss 0 38,664
Net periodic pension cost $ (31,161) $ 32,337