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Note 10 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Unrealized losses | $ (836,071) | $ (43,947)
Unrealized losses | 215,205 | 11,311
Unrealized losses | (620,866) | (32,636)
Transfer of realized gains to interest expense | (545,183) | (290,779)
Transfer of realized gains to interest expense | 140,329 | (74,845)
Transfer of realized gains to interest expense | (404,854) | (215,934)
Net interest rate swaps | (1,381,254) | 246,832
Net interest rate swaps | 355,534 | (63,534)
Net interest rate swaps | (1,025,720) | 183,298
Amortization of actuarial losses | 16,015 | 19,703
Amortization of actuarial losses | (4,122) | (5,072)
Amortization of actuarial losses | 11,893 | 14,631
Other comprehensive loss | (1,365,239) | (227,129)
Other comprehensive loss | 351,412 | 58,462
Other comprehensive loss | 1,013,827 | 168,667
Unrealized gains (losses) | 836,071 | 43,947
Unrealized gains (losses) | (215,205) | (11,311)
Unrealized gains (losses) | 620,866 | 32,636
Transfer of realized gains to interest expense | (140,329) | 74,845
Net interest rate swaps | 1,381,254 | (246,832)
Net interest rate swaps | (355,534) | 63,534
Net interest rate swaps | $ 1,025,720 | $ (183,298)

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