Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Net Income Per Share - Weighted Average Common Shares Outstanding (Details)

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Note 2 - Net Income Per Share - Weighted Average Common Shares Outstanding (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Net income $ 3,639,784 $ 747,897 $ 6,803,223 $ 1,249,055
Weighted average common shares (in shares) 13,730,150 13,521,172 13,711,135 13,516,608
Dilutive potential common shares (in shares) 49,629 26,956 55,066
Weighted average dilutive common shares outstanding (in shares) 13,779,779 13,521,172 13,738,090 13,571,674
Basic (in dollars per share) $ 0.27 $ 0.05 $ 0.50 $ 0.09
Diluted (in dollars per share) $ 0.27 $ 0.05 $ 0.50 $ 0.09