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Note 8 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 99,701,709	$ 88,887,977
Other comprehensive income	351,083	183,589
Balance	102,294,845	92,549,541
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(888,210)
Other comprehensive income	362,274	168,725
Balance	(525,936)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance	(647,224)
Other comprehensive income	(11,191)	14,864
Balance	(658,415)
AOCI Attributable to Parent [Member]
Balance	(1,535,434)	(3,447,944)
Other comprehensive income	351,083	183,589
Balance	$ (1,184,351)	$ (3,264,355)

X

- Definition

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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