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Note 11 - Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Dec. 31, 2024
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Three Months Ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 694,177 |  |  | $ | (178,681 | ) |  | $ | 515,496 |
Transfer of realized gains to interest expense |  |  | (384,273 | ) |  |  | 98,912 |  |  |  | (285,361 | )
Net interest rate swaps |  |  | 309,904 |  |  |  | (79,769 | ) |  |  | 230,135 |
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial gains |  |  | (10,378 | ) |  |  | 2,671 |  |  |  | (7,707 | )
Other comprehensive income |  | $ | 299,526 |  |  | $ | (77,098 | ) |  | $ | 222,428 |
Three Months Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses |  | $ | (836,071 | ) |  | $ | 215,205 |  |  | $ | (620,866 | )
Transfer of realized gains to interest expense |  |  | (545,183 | ) |  |  | 140,329 |  |  |  | (404,854 | )
Net interest rate swaps |  |  | (1,381,254 | ) |  |  | 355,534 |  |  |  | (1,025,720 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 16,015 |  |  |  | (4,122 | ) |  |  | 11,893 |
Other comprehensive loss |  | $ | (1,365,239 | ) |  | $ | 351,412 |  |  | $ | (1,013,827 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Accumulated |
|  |  |  |  |  |  |  |  |  | Other |
|  | Interest Rate |  |  | Defined Benefit |  |  | Comprehensive |
|  | Swaps |  |  | Plans |  |  | Income |
Balance at September 30, 2024 |  | $ | 1,531,649 |  |  | $ | (205,078 | ) |  | $ | 1,326,571 |
Other comprehensive income (loss) |  |  | 230,135 |  |  |  | (7,707 | ) |  |  | 222,428 |
Balance at December 31, 2024 |  | $ | 1,761,784 |  |  | $ | (212,785 | ) |  | $ | 1,548,999 |

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