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Note 1 - Summary of Significant Accounting Policies - Schedule of Other Comprehensive Income and Loss (Details) - USD ($)
 12 Months Ended
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