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Note 1 - Summary of Significant Accounting Policies - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Unrealized gains (losses), before tax | $ 207,015 | $ (554,778)
Unrealized gains (losses), tax | (53,287) | 142,800
Unrealized gains (losses) | 153,728 | (411,978)
Transfer of realized gains to interest expense, before tax | (1,374,643) | (2,000,126)
Transfer of realized gains to interest expense, tax | (353,834) | (514,831)
Transfer of realized gains to interest expense | (1,020,809) | (1,485,295)
Net interest rate swaps, before tax | (1,167,628) | (2,554,904)
Net interest rate swaps, tax | 300,547 | 657,631
Net interest rate swaps | (867,081) | (1,897,273)
Net losses arising during period | (282,941) | 1,233,462
Net losses arising during period | 72,828 | (317,492)
Net losses arising during period | (210,113) |
Amortization of actuarial losses, before tax | 16,638 | (73,505)
Amortization of actuarial losses, tax | (4,283) | (18,920)
Amortization of actuarial losses | 12,355 | 54,585
Net defined benefit plans, before tax | (266,303) | 1,306,967
Net defined benefit plans, tax | 68,545 | (336,412)
Net defined benefit plans | (197,758) | 970,555
Other comprehensive loss | (1,433,931) | (1,247,937)
Other comprehensive loss | 369,092 | 321,219
Other comprehensive loss | (1,064,839) | (926,718)
Amortization of actuarial losses | (16,638) | 73,505
Other comprehensive loss | 369,092 | 321,219
Other comprehensive loss | (1,064,839) | (926,718)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |
Net losses arising during period |  | 915,970
Other comprehensive loss | (197,758) | 970,555
Other comprehensive loss | $ (197,758) | $ 970,555

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