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Note 14 - Net Income (Loss) Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 31, 2023
Jul. 31, 2023
Apr. 30, 2023
Jan. 31, 2023
Oct. 31, 2022
Jul. 31, 2022
Apr. 30, 2022
Jan. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Net income (loss)                 $ 2,066,498 $ (347,091) $ 6,610,516
Shares (denominator) (in shares)                 7,880,429 7,523,022 7,587,686
Net income (loss) per share - basic and diluted (in dollars per share) $ (0.17) $ 0.01 $ 0.31 $ 0.1 $ 0.15 $ (0.05) $ (0.03) $ (0.12) $ 0.26 $ (0.05) $ 0.87