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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, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Net income (loss) (numerator)                 $ 6,610,516 $ (6,121,224) $ (5,669,321)
Shares (denominator) (in shares)                 7,587,686 7,354,513 7,387,141
Basic and diluted net income (loss) per share (in dollars per share) $ 0.00 $ 0.71 $ 0.45 $ (0.29) $ (0.06) $ (0.20) $ (0.23) $ (0.35) $ 0.87 $ (0.83) $ (0.77)