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Note 11 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2024 | Jun. 30, 2023
Unrealized gains (losses) | $ 207,785 |  |  | $ 1,111,338 |  |  | $ (174,113) | $ (894,741)
Unrealized gains (losses) | (53,484) |  |  | (286,058) |  |  | 44,816 | 230,304
Unrealized gains (losses) | 154,301 |  |  | 825,280 |  |  | (129,297) | (664,437)
Transfer of realized gains to interest expense | (476,053) |  |  | (490,371) |  |  | (1,554,942) | (1,200,862)
Transfer of realized gains to interest expense | 122,535 |  |  | 126,221 |  |  | 400,240 | 309,100
Transfer of realized gains to interest expense | (353,518) |  |  | (364,150) |  |  | (1,154,702) | (891,762)
Net interest rate swaps | (268,268) |  |  | 620,967 |  |  | (1,380,829) | (306,121)
Net interest rate swaps | 69,051 |  |  | (159,837) |  |  | 355,424 | 78,796
Net interest rate swaps | (199,217) |  |  | 461,130 |  |  | (1,025,405) | (227,325)
Amortization of net actuarial losses | 16,015 |  |  | 19,703 |  |  | 48,045 | 59,109
Amortization of net actuarial losses | (4,122) |  |  | (5,072) |  |  | (12,366) | (15,216)
Amortization of net actuarial losses | 11,893 |  |  | 14,631 |  |  | 35,679 | 43,893
Other comprehensive loss | (252,253) |  |  | 640,670 |  |  | (1,332,784) | (247,012)
Other comprehensive loss | 64,929 |  |  | (164,909) |  |  | 343,058 | 63,580
Other comprehensive loss | (187,324) | $ 211,425 | $ (1,013,827) | 475,761 | $ (490,526) | $ (168,667) | (989,726) | (183,432)
Unrealized gains | (207,785) |  |  | (1,111,338) |  |  | 174,113 | 894,741
Unrealized gains | 53,484 |  |  | 286,058 |  |  | (44,816) | (230,304)
Unrealized gains | $ (154,301) |  |  | $ (825,280) |  |  | $ 129,297 | $ 664,437

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