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Note 11 - Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Mar. 31, 2024
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 802,399 |  |  | $ | (206,537 | ) |  | $ | 595,862 |
Transfer of realized gains to interest expense |  |  | (533,706 | ) |  |  | 137,376 |  |  |  | (396,330 | )
Net interest rate swaps |  |  | 268,693 |  |  |  | (69,161 | ) |  |  | 199,532 |
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 16,015 |  |  |  | (4,122 | ) |  |  | 11,893 |
Other comprehensive income |  | $ | 284,708 |  |  | $ | (73,283 | ) |  | $ | 211,425 |
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses |  | $ | (260,544 | ) |  | $ | 67,065 |  |  | $ | (193,479 | )
Transfer of realized gains to interest expense |  |  | (419,712 | ) |  |  | 108,034 |  |  |  | (311,678 | )
Net interest rate swaps |  |  | (680,256 | ) |  |  | 175,099 |  |  |  | (505,157 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 19,703 |  |  |  | (5,072 | ) |  |  | 14,631 |
Other comprehensive loss |  | $ | (660,553 | ) |  | $ | 170,027 |  |  | $ | (490,526 | )
|  |  |  |  |  | Tax |  |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Six Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses |  | $ | (33,672 | ) |  | $ | 8,668 |  |  | $ | (25,004 | )
Transfer of realized gains to interest expense |  |  | (1,078,889 | ) |  |  | 277,705 |  |  |  | (801,184 | )
Net interest rate swaps |  |  | (1,112,561 | ) |  |  | 286,373 |  |  |  | (826,188 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 32,030 |  |  |  | (8,244 | ) |  |  | 23,786 |
Other comprehensive loss |  | $ | (1,080,531 | ) |  | $ | 278,129 |  |  | $ | (802,402 | )
Six Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses |  | $ | (216,597 | ) |  | $ | 55,754 |  |  | $ | (160,843 | )
Transfer of realized gains to interest expense |  |  | (710,491 | ) |  |  | 182,879 |  |  |  | (527,612 | )
Net interest rate swaps |  |  | (927,088 | ) |  |  | 238,633 |  |  |  | (688,455 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 39,406 |  |  |  | (10,144 | ) |  |  | 29,262 |
Other comprehensive loss |  | $ | (887,682 | ) |  | $ | 228,489 |  |  | $ | (659,193 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Accumulated |
|  |  |  |  |  |  |  |  |  | Other |
|  | Interest Rate |  |  | Defined Benefit |  |  | Comprehensive |
|  | Swaps |  |  | Plans |  |  | Income (Loss) |
Balance at September 30, 2023 |  | $ | 3,428,922 |  |  | $ | (1,175,633 | ) |  | $ | 2,253,289 |
Other comprehensive income (loss) |  |  | (826,188 | ) |  |  | 23,786 |  |  |  | (802,402 | )
Balance at March 31, 2024 |  | $ | 2,602,734 |  |  | $ | (1,151,847 | ) |  | $ | 1,450,887 |

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