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Note 12 - Employee Benefit Plans - Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Benefit plan assets under other non-current assets $ 5,416,536 $ 1,901,902
Benefit plan liabilities under deferred credits and other non-current liabilities (113,600) (47,674)
Pension Plan [Member]    
Accumulated benefit obligation 26,859,162 24,449,856
Benefit obligation at beginning of year 26,747,624 27,268,456
Service cost 324,265 366,537
Interest cost 1,468,822 1,372,098
Actuarial loss (gain) 2,613,621 (1,031,160)
Benefit payments, net of retiree contributions (1,280,904) (1,228,307)
Benefit obligation at end of year 29,873,428 26,747,624
Fair value of plan assets at beginning of year 26,878,661 28,017,797
Actual return on plan assets, net of taxes 5,456,381 89,171
Employer contributions 0 0
Benefit payments, net of retiree contributions (1,280,904) (1,228,307)
Fair value of plan assets at end of year 31,054,138 26,878,661
Funded status 1,180,710 131,037
Benefit plan assets under other non-current assets 1,180,710 131,037
Benefit plan liabilities under deferred credits and other non-current liabilities 0 0
Net actuarial loss (gain), net of tax 432,149 1,168,687
Total amounts included in accumulated other comprehensive income, net of tax 432,149 1,168,687
Net actuarial loss (gain) 3,041,666 4,029,282
Amounts recognized as regulatory assets (liabilities) 3,041,666 4,029,282
Other Postretirement Benefits Plan [Member]    
Accumulated benefit obligation 10,842,455 11,248,448
Benefit obligation at beginning of year 11,248,448 12,416,546
Service cost 30,398 45,897
Interest cost 613,477 620,622
Actuarial loss (gain) (540,914) (1,331,541)
Benefit payments, net of retiree contributions (508,954) (503,076)
Benefit obligation at end of year 10,842,455 11,248,448
Fair value of plan assets at beginning of year 13,019,313 12,138,119
Actual return on plan assets, net of taxes 2,567,922 1,384,270
Employer contributions 0 0
Benefit payments, net of retiree contributions (508,954) (503,076)
Fair value of plan assets at end of year 15,078,281 13,019,313
Funded status 4,235,826 1,770,865
Benefit plan assets under other non-current assets 4,235,826 1,770,865
Benefit plan liabilities under deferred credits and other non-current liabilities 0 0
Net actuarial loss (gain), net of tax (227,071) 6,946
Total amounts included in accumulated other comprehensive income, net of tax (227,071) 6,946
Net actuarial loss (gain) (4,032,929) (1,813,071)
Amounts recognized as regulatory assets (liabilities) $ (4,032,929) $ (1,813,071)