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Note 10 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Net income $ 6,443,390 $ 5,019,992 $ 6,341,886 $ 3,256,405 $ 11,463,382 $ 9,598,291
Weighted average common shares (in shares) 10,170,595   9,911,202   10,099,533 9,870,259
Options to purchase common stock (in shares) 3,411   7,506   2,751 7,242
Diluted average common shares (in shares) 10,174,006   9,918,708   10,102,284 9,877,501
Basic (in dollars per share) $ 0.63   $ 0.64   $ 1.14 $ 0.97
Diluted (in dollars per share) $ 0.63   $ 0.64   $ 1.13 $ 0.97