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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, 2025
Sep. 30, 2024
Benefit plan assets under other non-current assets $ 5,935,885 $ 5,416,536
Pension Plan [Member]    
Accumulated benefit obligation 26,298,490 26,859,162
Benefit obligation at beginning of year 29,873,428 26,747,624
Service cost 387,429 324,265
Interest cost 1,410,406 1,468,822
Actuarial loss (gain) (752,215) 2,613,621
Benefit payments, net of retiree contributions (1,439,028) (1,280,904)
Benefit obligation at end of year 29,480,020 29,873,428
Fair value of plan assets at beginning of year 31,054,138 26,878,661
Actual return on plan assets, net of taxes 872,291 5,456,381
Employer contributions 0 0
Benefit payments, net of retiree contributions (1,439,028) (1,280,904)
Fair value of plan assets at end of year 30,487,401 31,054,138
Funded status 1,007,381 1,180,710
Benefit plan assets under other non-current assets 1,007,381 1,180,710
Net actuarial loss (gain), net of tax 923,823 432,149
Total amounts included in accumulated other comprehensive income, net of tax 923,823 432,149
Net actuarial loss (gain) 2,199,542 3,041,666
Amounts recognized as regulatory assets (liabilities) 2,199,542 3,041,666
Other Postretirement Benefits Plan [Member]    
Accumulated benefit obligation 10,462,318 10,842,455
Benefit obligation at beginning of year 10,842,455 11,248,448
Service cost 4,376 30,398
Interest cost 507,423 613,477
Actuarial loss (gain) (297,327) (540,914)
Benefit payments, net of retiree contributions (594,609) (508,954)
Benefit obligation at end of year 10,462,318 10,842,455
Fair value of plan assets at beginning of year 15,078,281 13,019,313
Actual return on plan assets, net of taxes 907,150 2,567,922
Employer contributions 0 0
Benefit payments, net of retiree contributions (594,609) (508,954)
Fair value of plan assets at end of year 15,390,822 15,078,281
Funded status 4,928,504 4,235,826
Benefit plan assets under other non-current assets 4,928,504 4,235,826
Net actuarial loss (gain), net of tax (520,987) (227,071)
Total amounts included in accumulated other comprehensive income, net of tax (520,987) (227,071)
Net actuarial loss (gain) (3,879,294) (4,032,929)
Amounts recognized as regulatory assets (liabilities) $ (3,879,294) $ (4,032,929)