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Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (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
Balance	$ 117,833,223	$ 111,761,089	$ 108,136,775	$ 110,543,862	$ 103,544,603	$ 100,732,625	$ 108,136,775	$ 100,732,625
Other comprehensive income	(263,406)	(373,852)	222,428	(187,324)	211,425	(1,013,827)	(414,830)	(989,726)
Other comprehensive loss	(263,406)	(373,852)	222,428	(187,324)	211,425	(1,013,827)	(414,830)	(989,726)
Balance	116,261,318	117,833,223	111,761,089	108,767,792	110,543,862	103,544,603	116,261,318	108,767,792
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance			1,531,649				1,531,649
Other comprehensive income							(391,709)
Other comprehensive loss							(391,709)
Balance	1,139,940						1,139,940
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance			(205,078)				(205,078)
Other comprehensive income							(23,121)
Other comprehensive loss							(23,121)
Balance	(228,199)						(228,199)
AOCI Attributable to Parent [Member]
Balance	1,175,147	1,548,999	1,326,571	1,450,887	1,239,462	2,253,289	1,326,571	2,253,289
Other comprehensive income	(263,406)	(373,852)	222,428	(187,324)	211,425	(1,013,827)	(414,830)
Other comprehensive loss	(263,406)	(373,852)	222,428	(187,324)	211,425	(1,013,827)	(414,830)
Balance	$ 911,741	$ 1,175,147	$ 1,548,999	$ 1,263,563	$ 1,450,887	$ 1,239,462	$ 911,741	$ 1,263,563

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