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Note 11 - Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Three Months Ended June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 207,785 |  |  | $ | (53,484 | ) |  | $ | 154,301 |
Transfer of realized gains to interest expense |  |  | (476,053 | ) |  |  | 122,535 |  |  |  | (353,518 | )
Net interest rate swaps |  |  | (268,268 | ) |  |  | 69,051 |  |  |  | (199,217 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 16,015 |  |  |  | (4,122 | ) |  |  | 11,893 |
Other comprehensive loss |  | $ | (252,253 | ) |  | $ | 64,929 |  |  | $ | (187,324 | )
Three Months Ended June 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 1,111,338 |  |  | $ | (286,058 | ) |  | $ | 825,280 |
Transfer of realized gains to interest expense |  |  | (490,371 | ) |  |  | 126,221 |  |  |  | (364,150 | )
Net interest rate swaps |  |  | 620,967 |  |  |  | (159,837 | ) |  |  | 461,130 |
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 19,703 |  |  |  | (5,072 | ) |  |  | 14,631 |
Other comprehensive income |  | $ | 640,670 |  |  | $ | (164,909 | ) |  | $ | 475,761 |
|  |  |  |  |  | Tax |  |  |  |  |
|  | Before-Tax |  |  | (Expense) |  |  | Net-of-Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Nine Months Ended June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 174,113 |  |  | $ | (44,816 | ) |  | $ | 129,297 |
Transfer of realized gains to interest expense |  |  | (1,554,942 | ) |  |  | 400,240 |  |  |  | (1,154,702 | )
Net interest rate swaps |  |  | (1,380,829 | ) |  |  | 355,424 |  |  |  | (1,025,405 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 48,045 |  |  |  | (12,366 | ) |  |  | 35,679 |
Other comprehensive loss |  | $ | (1,332,784 | ) |  | $ | 343,058 |  |  | $ | (989,726 | )
Nine Months Ended June 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 894,741 |  |  | $ | (230,304 | ) |  | $ | 664,437 |
Transfer of realized gains to interest expense |  |  | (1,200,862 | ) |  |  | 309,100 |  |  |  | (891,762 | )
Net interest rate swaps |  |  | (306,121 | ) |  |  | 78,796 |  |  |  | (227,325 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  | 59,109 |  |  |  | (15,216 | ) |  |  | 43,893 |
Other comprehensive loss |  | $ | (247,012 | ) |  | $ | 63,580 |  |  | $ | (183,432 | )
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) |  |  | (1,025,405 | ) |  |  | 35,679 |  |  |  | (989,726 | )
Balance at June 30, 2024 |  | $ | 2,403,517 |  |  | $ | (1,139,954 | ) |  | $ | 1,263,563 |

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