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Note 12 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net income $ 5,019,992 $ 3,256,405
Weighted average common shares (in shares) 10,029,243 9,830,206
Options to purchase common stock (in shares) 2,111 6,982
Diluted average common shares (in shares) 10,031,354 9,837,188
Basic (in dollars per share) $ 0.5 $ 0.33
Diluted (in dollars per share) $ 0.5 $ 0.33