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Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024
Balance	$ 111,761,089	$ 108,136,775	$ 103,544,603	$ 100,732,625	$ 108,136,775	$ 100,732,625
Other comprehensive income	(373,852)	222,428	211,425	(1,013,827)	(151,424)	(802,402)
Other comprehensive loss	(373,852)	222,428	211,425	(1,013,827)	(151,424)	(802,402)
Balance	117,833,223	111,761,089	110,543,862	103,544,603	117,833,223	110,543,862
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		1,531,649			1,531,649
Other comprehensive income					(136,011)
Other comprehensive loss					(136,011)
Balance	1,395,638				1,395,638
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance		(205,078)			(205,078)
Other comprehensive income					(15,413)
Other comprehensive loss					(15,413)
Balance	(220,491)				(220,491)
AOCI Attributable to Parent [Member]
Balance	1,548,999	1,326,571	1,239,462	2,253,289	1,326,571	2,253,289
Other comprehensive income	(373,852)	222,428	211,425	(1,013,827)	(151,424)
Other comprehensive loss	(373,852)	222,428	211,425	(1,013,827)	(151,424)
Balance	$ 1,175,147	$ 1,548,999	$ 1,450,887	$ 1,239,462	$ 1,175,147	$ 1,450,887

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