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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)

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- Definition Amount deferred to regulatory asset for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References No definition available. + Details
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