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Note 10 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Balance	$ 102,294,845	$ 99,701,709	$ 92,549,541	$ 88,887,977	$ 99,701,709	$ 88,887,977
Other comprehensive income	1,524,308	351,083	509,158	183,589	1,875,391	692,747
Balance	105,462,729	102,294,845	97,574,608	92,549,541	105,462,729	97,574,608
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		(888,210)			(888,210)
Other comprehensive income					1,897,773
Balance	1,009,563				1,009,563
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance		(647,224)			(647,224)
Other comprehensive income					(22,382)
Balance	(669,606)				(669,606)
AOCI Attributable to Parent [Member]
Balance	(1,184,351)	(1,535,434)	(3,264,355)	(3,447,944)	(1,535,434)	(3,447,944)
Other comprehensive income	1,524,308	351,083	509,158	183,589	1,875,391
Balance	$ 339,957	$ (1,184,351)	$ (2,755,197)	$ (3,264,355)	$ 339,957	$ (2,755,197)

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

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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