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Note 15 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Plan [Member] |  |  |  |
Service cost | $ 96,858 | $ 81,066 | $ 290,574 | $ 243,198
Interest cost | 352,602 | 367,206 | 1,057,806 | 1,101,618
Expected return on plan assets | (375,976) | (294,958) | (1,127,928) | (884,874)
Recognized loss | 14,857 | 79,132 | 44,571 | 237,396
Net periodic pension cost | 88,341 | 232,446 | 265,023 | 697,338
Postemployment Retirement Benefits [Member] |  |  |  |
Service cost | 1,095 | 7,599 | 3,285 | 22,797
Interest cost | 126,856 | 153,369 | 380,568 | 460,107
Expected return on plan assets | (182,430) | (133,311) | (547,290) | (399,933)
Recognized loss | (58,153) | (10,149) | (174,459) | (30,447)
Net periodic pension cost | $ (112,632) | $ 17,508 | $ (337,896) | $ 52,524

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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