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Note 1 - Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Net income $ 13,279,970 $ 11,760,896
Weighted-average common shares (in shares) 10,304,109 10,152,909
Options to purchase common stock (in shares) 4,577 3,571
Diluted average common shares (in shares) 10,308,686 10,156,480
Basic (in dollars per share) $ 1.29 $ 1.16
Diluted (in dollars per share) $ 1.29 $ 1.16