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Note 9 - Net Income (Loss) Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 31, 2023
Apr. 30, 2023
Jan. 31, 2023
Jul. 31, 2022
Apr. 30, 2022
Jan. 31, 2022
Jul. 31, 2023
Jul. 31, 2022
Net income (loss) $ 100,803 $ 2,423,087 $ 809,984 $ (371,871) $ (227,991) $ (935,793) $ 3,333,874 $ (1,535,655)
Shares (denominator) (in shares) 7,866,673     7,516,757     7,875,963 7,525,482
Net income (loss) per share: Basic and diluted (in dollars per share) $ 0.01     $ (0.05)     $ 0.42 $ (0.20)