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Note 10 - Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Dec. 31, 2023
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
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 actuarial losses |  |  | 16,015 |  |  |  | (4,122 | ) |  |  | 11,893 |
Other comprehensive loss |  | $ | (1,365,239 | ) |  | $ | 351,412 |  |  | $ | (1,013,827 | )
Three Months Ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 43,947 |  |  | $ | (11,311 | ) |  | $ | 32,636 |
Transfer of realized gains to interest expense |  |  | (290,779 | ) |  |  | 74,845 |  |  |  | (215,934 | )
Net interest rate swaps |  |  | (246,832 | ) |  |  | 63,534 |  |  |  | (183,298 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses |  |  | 19,703 |  |  |  | (5,072 | ) |  |  | 14,631 |
Other comprehensive loss |  | $ | (227,129 | ) |  | $ | 58,462 |  |  | $ | (168,667 | )
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) |  |  | (1,025,720 | ) |  |  | 11,893 |  |  |  | (1,013,827 | )
Balance at December 31, 2023 |  | $ | 2,403,202 |  |  | $ | (1,163,740 | ) |  | $ | 1,239,462 |

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