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Note 10 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net income $ 5,269,689 $ 5,019,992
Weighted-average common shares (in shares) 10,259,717 10,029,243
Options to purchase common stock (in shares) 4,280 2,111
Diluted average common shares (in shares) 10,263,997 10,031,354
Basic (in dollars per share) $ 0.51 $ 0.5
Diluted (in dollars per share) $ 0.51 $ 0.5