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Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Balance | $ 103,544,603 | $ 100,732,625 | $ 94,890,007 | $ 93,090,656 | $ 100,732,625 | $ 93,090,656
Other comprehensive income (loss) | 211,425 | (1,013,827) | (490,526) | (168,667) | (802,402) | (659,193)
Balance | 110,543,862 | 103,544,603 | 100,278,408 | 94,890,007 | 110,543,862 | 100,278,408
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |
Balance |  | 3,428,922 |  |  | 3,428,922 |
Other comprehensive income (loss) |  |  |  |  | (826,188) |
Balance | 2,602,734 |  |  |  | 2,602,734 |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Balance |  | (1,175,633) |  |  | (1,175,633) |
Other comprehensive income (loss) |  |  |  |  | 23,786 |
Balance | (1,151,847) |  |  |  | (1,151,847) |
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Balance | 1,239,462 | 2,253,289 | 1,795,697 | 1,964,364 | 2,253,289 | 1,964,364
Other comprehensive income (loss) | 211,425 | (1,013,827) | (490,526) | (168,667) | (802,402) |
Balance | $ 1,450,887 | $ 1,239,462 | $ 1,305,171 | $ 1,795,697 | $ 1,450,887 | $ 1,305,171

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