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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