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Note 11 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024
Unrealized gains (losses), before tax | $ (20,816) |  |  | $ 207,785 |  |  | $ 507,492 | $ 174,113
Unrealized gains (losses), tax | 5,358 |  |  | (53,484) |  |  | (130,628) | (44,816)
Unrealized gains (losses), after tax | (15,458) |  |  | 154,301 |  |  | 376,864 | 129,297
Transfer of realized gains to interest expense, before tax | (323,513) |  |  | (476,053) |  |  | (1,034,976) | (1,554,942)
Transfer of realized gains to interest expense, tax | 83,273 |  |  | 122,535 |  |  | 266,403 | 400,240
Transfer of realized gains to interest expense, after tax | (240,240) |  |  | (353,518) |  |  | (768,573) | (1,154,702)
Net interest rate swaps, before tax | (344,329) |  |  | (268,268) |  |  | (527,484) | (1,380,829)
Net interest rate swaps, tax | 88,631 |  |  | 69,051 |  |  | 135,775 | 355,424
Interest rate swaps | (255,698) |  |  | (199,217) |  |  | (391,709) | (1,025,405)
Amortization of net actuarial gains, before tax | (10,379) |  |  | 16,015 |  |  | (31,134) | 48,045
Amortization of net actuarial gains, tax | 2,671 |  |  | (4,122) |  |  | 8,013 | (12,366)
Amortization of net actuarial gains, after tax | (7,708) |  |  | 11,893 |  |  | (23,121) | 35,679
Other comprehensive income (loss), before tax | (354,708) |  |  | 252,253 |  |  | (558,618) | (1,332,784)
Other comprehensive income (loss), tax | 91,302 |  |  | 64,929 |  |  | 143,788 | 343,058
Other comprehensive income (loss), after tax | (263,406) | $ (373,852) | $ 222,428 | (187,324) | $ 211,425 | $ (1,013,827) | (414,830) | (989,726)
Unrealized gains (losses), before tax | (20,816) |  |  | 207,785 |  |  | 507,492 | 174,113
Amortization of net actuarial gains (losses), after tax | (7,708) |  |  | 11,893 |  |  | (23,121) | 35,679
Other comprehensive income (loss), before tax | 354,708 |  |  | (252,253) |  |  | 558,618 | 1,332,784
Other comprehensive income (loss), tax | $ 91,302 |  |  | $ 64,929 |  |  | $ 143,788 | $ 343,058

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