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Note 15 - Employee Benefit Plans (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 81,066 |  |  | $ | 91,635 |  |  | $ | 243,198 |  |  | $ | 274,905 |
Interest cost |  |  | 367,206 |  |  |  | 343,025 |  |  |  | 1,101,618 |  |  |  | 1,029,075 |
Expected return on plan assets |  |  | (294,958 | ) |  |  | (308,149 | ) |  |  | (884,874 | ) |  |  | (924,447 | )
Recognized loss |  |  | 79,132 |  |  |  | 79,181 |  |  |  | 237,396 |  |  |  | 237,543 |
Net periodic pension cost |  | $ | 232,446 |  |  | $ | 205,692 |  |  | $ | 697,338 |  |  | $ | 617,076 |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Components of postretirement benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7,599 |  |  | $ | 11,475 |  |  | $ | 22,797 |  |  | $ | 34,425 |
Interest cost |  |  | 153,369 |  |  |  | 155,156 |  |  |  | 460,107 |  |  |  | 465,468 |
Expected return on plan assets |  |  | (133,311 | ) |  |  | (116,012 | ) |  |  | (399,933 | ) |  |  | (348,036 | )
Recognized gain |  |  | (10,149 | ) |  |  | — |  |  |  | (30,447 | ) |  |  | — |
Net postretirement benefit cost |  | $ | 17,508 |  |  | $ | 50,619 |  |  | $ | 52,524 |  |  | $ | 151,857 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration