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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, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023
Balance	$ 110,543,862	$ 103,544,603	$ 100,732,625	$ 100,278,408	$ 94,890,007	$ 93,090,656	$ 100,732,625	$ 93,090,656
Other comprehensive income (loss)	(187,324)	211,425	(1,013,827)	475,761	(490,526)	(168,667)	(989,726)	(183,432)
Balance	108,767,792	110,543,862	103,544,603	100,947,813	100,278,408	94,890,007	108,767,792	100,947,813
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance			3,428,922				3,428,922
Other comprehensive income (loss)							(1,025,405)
Balance	2,403,517						2,403,517
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance			(1,175,633)				(1,175,633)
Other comprehensive income (loss)							35,679
Balance	(1,139,954)						(1,139,954)
AOCI Attributable to Parent [Member]
Balance	1,450,887	1,239,462	2,253,289	1,305,171	1,795,697	1,964,364	2,253,289	1,964,364
Other comprehensive income (loss)	(187,324)	211,425	(1,013,827)	475,761	(490,526)	(168,667)	(989,726)
Balance	$ 1,263,563	$ 1,450,887	$ 1,239,462	$ 1,780,932	$ 1,305,171	$ 1,795,697	$ 1,263,563	$ 1,780,932

X

- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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