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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, 2024
Sep. 30, 2023
Unrealized losses $ (554,778) $ 1,560,426
Unrealized losses 142,800 (401,652)
Unrealized losses (411,978) 1,158,774
Transfer of realized gains to interest expense, before tax (2,000,126) 1,741,437
Transfer of realized gains to interest expense, tax 514,831 448,244
Transfer of realized gains to interest expense (1,485,295) (1,293,193)
Net interest rate swaps, before tax (2,554,904) (181,011)
Net interest rate swaps, tax 657,631 46,592
Net interest rate swaps (1,897,273) (134,419)
Net gain (losses) arising during period, before tax 1,233,462 491,270
Net gain (losses) arising during period, tax (317,492) (126,453)
Net gain (losses) arising during period   364,817
Amortization of actuarial losses, before tax 73,505 (78,813)
Amortization of actuarial losses, tax (18,920) (20,286)
Amortization of actuarial losses 54,585 58,527
Net defined benefit plans, before tax 1,306,967 570,083
Net defined benefit plans, tax (336,412) (146,739)
Net defined benefit plans 970,555 423,344
Other comprehensive loss (1,247,937) 389,072
Other comprehensive loss 321,219 (100,147)
Other comprehensive loss (926,718) 288,925
Transfer of realized gains to interest expense 2,000,126 (1,741,437)
Net gains arising during period 1,233,462 491,270
Amortization of actuarial losses (73,505) 78,813
Other comprehensive income (loss) (926,718) 288,925
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Net gain (losses) arising during period 915,970  
Other comprehensive loss 970,555 423,344
Other comprehensive income (loss) $ 970,555 $ 423,344