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Note 9 - Employee Benefit Plans - Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Non-current assets $ 1,901,902 $ 749,341
Non-current liabilities (47,674) (337,535)
Pension Plan [Member]    
Accumulated benefit obligation 24,449,856 24,776,968
Benefit obligation at beginning of year 27,268,456 37,654,468
Service cost 366,537 648,289
Interest cost 1,372,098 1,013,115
Actuarial gain (1,031,160) (10,862,957)
Benefit payments, net of retiree contributions (1,228,307) (1,184,459)
Benefit obligation at end of year 26,747,624 27,268,456
Fair value of plan assets at beginning of year 28,017,797 38,914,107
Actual return on plan assets, net of taxes 89,171 (9,711,851)
Defined Benefit Plan, Plan Assets, Contributions by Employer 0 0
Benefit payments, net of retiree contributions (1,228,307) (1,184,459)
Fair value of plan assets at end of year 26,878,661 28,017,797
Funded status 131,037 749,341
Non-current assets 131,037 749,341
Non-current liabilities 0 0
Net actuarial loss, net of tax 1,168,687 1,243,889
Total amounts included in accumulated other comprehensive income, net of tax 1,168,687 1,243,889
Net actuarial loss (gain) 4,029,282 4,132,472
Amounts recognized as regulatory assets (liabilities) 4,029,282 4,132,472
Other Postretirement Benefits Plan [Member]    
Accumulated benefit obligation 11,248,448 12,416,546
Benefit obligation at beginning of year 12,416,546 16,796,849
Service cost 45,897 97,802
Interest cost 620,622 443,721
Actuarial gain (1,331,541) (4,330,387)
Benefit payments, net of retiree contributions (503,076) (591,439)
Benefit obligation at end of year 11,248,448 12,416,546
Fair value of plan assets at beginning of year 12,138,119 15,882,342
Actual return on plan assets, net of taxes 1,384,270 (3,152,784)
Defined Benefit Plan, Plan Assets, Contributions by Employer 0 0
Benefit payments, net of retiree contributions (503,076) (591,439)
Fair value of plan assets at end of year 13,019,313 12,138,119
Funded status 1,770,865 (278,427)
Non-current assets 1,770,865 0
Non-current liabilities 0 (278,427)
Net actuarial loss, net of tax 6,946 355,088
Total amounts included in accumulated other comprehensive income, net of tax 6,946 355,088
Net actuarial loss (gain) (1,813,071) (30,118)
Amounts recognized as regulatory assets (liabilities) $ (1,813,071) $ (30,118)