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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, 2023
Sep. 30, 2022
Unrealized gains (losses), before tax $ 1,560,426 $ 5,617,251
Unrealized gains (losses), tax (401,652) (1,445,878)
Unrealized gains (losses) 1,158,774 4,171,373
Transfer of realized gains to interest expense, before tax (1,741,437) 377,299
Transfer of realized gains to interest expense, tax 448,244 (97,121)
Transfer of realized gains to interest expense (1,293,193) 280,178
Net interest rate swaps, before tax (181,011) 5,994,550
Net interest rate swaps, tax 46,592 (1,542,999)
Net interest rate swaps (134,419) 4,451,551
Net gain (losses) arising during period, before tax 491,270 (1,221,368)
Net gain (losses) arising during period, tax (126,453) 314,379
Net gain (losses) arising during period   (906,989)
Amortization of actuarial losses, before tax 78,813 (60,280)
Amortization of actuarial losses, tax (20,286) 15,516
Amortization of actuarial losses 58,527 (44,764)
Net defined benefit plans, before tax 570,083 (1,281,648)
Net defined benefit plans, tax (146,739) 329,895
Net defined benefit plans 423,344 (951,753)
Other comprehensive income (loss), before tax 389,072 4,712,902
Other comprehensive income (loss), tax (100,147) (1,213,104)
Other comprehensive income (loss) 288,925 3,499,798
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Net gain (losses) arising during period 364,817  
Other comprehensive income (loss) $ 423,344 $ (951,753)