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Note 15 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Pension Plan [Member]
Service cost	$ 96,858	$ 81,066	$ 193,716	$ 162,132
Interest cost	352,602	367,206	705,204	734,412
Expected return on plan assets	(375,976)	(294,958)	(751,952)	(589,916)
Recognized loss	14,857	79,132	29,714	158,264
Net periodic pension cost	88,341	232,446	176,682	464,892
Postemployment Retirement Benefits [Member]
Service cost	1,095	7,599	2,190	15,198
Interest cost	126,856	153,369	253,712	306,738
Expected return on plan assets	(182,430)	(133,311)	(364,860)	(266,622)
Recognized loss	(58,153)	(10,149)	(116,306)	(20,298)
Net periodic pension cost	$ (112,632)	$ 17,508	$ (225,264)	$ 35,016

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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