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v3.25.3

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)

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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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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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