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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, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2025	Jun. 30, 2024
Unrealized gains (losses), before tax	$ (20,816)			$ 207,785			$ 507,492	$ 174,113
Unrealized gains (losses), tax	5,358			(53,484)			(130,628)	(44,816)
Unrealized gains (losses), after tax	(15,458)			154,301			376,864	129,297
Transfer of realized gains to interest expense, before tax	(323,513)			(476,053)			(1,034,976)	(1,554,942)
Transfer of realized gains to interest expense, tax	83,273			122,535			266,403	400,240
Transfer of realized gains to interest expense, after tax	(240,240)			(353,518)			(768,573)	(1,154,702)
Net interest rate swaps, before tax	(344,329)			(268,268)			(527,484)	(1,380,829)
Net interest rate swaps, tax	88,631			69,051			135,775	355,424
Interest rate swaps	(255,698)			(199,217)			(391,709)	(1,025,405)
Amortization of net actuarial gains, before tax	(10,379)			16,015			(31,134)	48,045
Amortization of net actuarial gains, tax	2,671			(4,122)			8,013	(12,366)
Amortization of net actuarial gains, after tax	(7,708)			11,893			(23,121)	35,679
Other comprehensive income (loss), before tax	(354,708)			252,253			(558,618)	(1,332,784)
Other comprehensive income (loss), tax	91,302			64,929			143,788	343,058
Other comprehensive income (loss), after tax	(263,406)	$ (373,852)	$ 222,428	(187,324)	$ 211,425	$ (1,013,827)	(414,830)	(989,726)
Unrealized gains (losses), before tax	(20,816)			207,785			507,492	174,113
Amortization of net actuarial gains (losses), after tax	(7,708)			11,893			(23,121)	35,679
Other comprehensive income (loss), before tax	354,708			(252,253)			558,618	1,332,784
Other comprehensive income (loss), tax	$ 91,302			$ 64,929			$ 143,788	$ 343,058

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