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Note 8 - Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Dec. 31, 2021
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Three Months Ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 315,983 |  |  | $ | (81,333 | ) |  | $ | 234,650 |
Transfer of realized losses to interest expense |  |  | 171,863 |  |  |  | (44,239 | ) |  |  | 127,624 |
Net interest rate swaps |  |  | 487,846 |  |  |  | (125,572 | ) |  |  | 362,274 |
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial gains |  |  | (15,070 | ) |  |  | 3,879 |  |  |  | (11,191 | )
Other comprehensive income |  | $ | 472,776 |  |  | $ | (121,693 | ) |  | $ | 351,083 |
Three Months Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 89,770 |  |  | $ | (23,107 | ) |  | $ | 66,663 |
Transfer of realized losses to interest expense |  |  | 137,438 |  |  |  | (35,376 | ) |  |  | 102,062 |
Net interest rate swaps |  |  | 227,208 |  |  |  | (58,483 | ) |  |  | 168,725 |
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses |  |  | 20,017 |  |  |  | (5,153 | ) |  |  | 14,864 |
Other comprehensive income |  | $ | 247,225 |  |  | $ | (63,636 | ) |  | $ | 183,589 |
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, 2021 |  | $ | (888,210 | ) |  | $ | (647,224 | ) |  | $ | (1,535,434 | )
Other comprehensive income (loss) |  |  | 362,274 |  |  |  | (11,191 | ) |  |  | 351,083 |
Balance at December 31, 2021 |  | $ | (525,936 | ) |  | $ | (658,415 | ) |  | $ | (1,184,351 | )

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