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Note 11 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Unrealized gains (losses), before tax | $ 694,177 | $ (836,071)
Unrealized gains (losses), tax | (178,681) | 215,205
Unrealized gains (losses), after tax | 515,496 | (620,866)
Transfer of realized gains to interest expense, before tax | (384,273) | (545,183)
Transfer of realized gains to interest expense, tax | 98,912 | 140,329
Transfer of realized gains to interest expense, after tax | (285,361) | (404,854)
Net interest rate swaps, before tax | 309,904 | (1,381,254)
Net interest rate swaps, tax | (79,769) | 355,534
Interest rate swaps | 230,135 | (1,025,720)
Amortization of net actuarial gains, before tax | (10,378) | 16,015
Amortization of net actuarial gains, tax | 2,671 | (4,122)
Amortization of net actuarial gains, after tax | (7,707) | 11,893
Other comprehensive income (loss), before tax | 299,526 | 1,365,239
Other comprehensive income (loss), tax | (77,098) | 351,412
Other comprehensive income (loss), after tax | 222,428 | (1,013,827)
Unrealized gains (losses), before tax | 694,177 | (836,071)
Amortization of net actuarial gains (losses), after tax | (7,707) | 11,893
Other comprehensive income (loss), before tax | (299,526) | (1,365,239)
Other comprehensive income (loss), tax | $ (77,098) | $ 351,412

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