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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 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Pension Plan [Member]        
Service cost $ 162,072 $ 183,570 $ 324,144 $ 367,140
Interest cost 253,279 243,785 506,558 487,570
Expected return on plan assets (457,888) (503,936) (915,776) (1,007,872)
Recognized loss 36,600 125,535 73,200 251,070
Net periodic pension cost (benefit) (5,937) 48,954 (11,874) 97,908
Postemployment Retirement Benefits [Member]        
Service cost 24,450 35,172 48,900 70,344
Interest cost 110,930 107,623 221,860 215,246
Expected return on plan assets (166,541) (149,122) (333,082) (298,244)
Recognized loss 0 38,664 0 77,328
Net periodic pension cost (benefit) $ (31,161) $ 32,337 $ (62,322) $ 64,674