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Note 10 - Earnings Per Share - Earnings Per Share (Details) - USD ($)	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 3,584,529	$ 4,723,263
Weighted average common shares (in shares)	8,383,986	8,167,793
Options to purchase common stock (in shares)	9,046	14,390
Diluted average common shares (in shares)	8,393,032	8,182,183
Basic (in dollars per share)	$ 0.43	$ 0.58
Diluted (in dollars per share)	$ 0.43	$ 0.58

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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