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Note 9 - Net Loss Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Apr. 30, 2019
Jan. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Net loss (numerator) $ (1,689,181) $ (2,591,888) $ (617,425) $ (3,310,020) $ (4,281,069) $ (3,927,445)
Shares (denominator) (in shares) 7,350,427   7,317,516   7,351,897 7,449,864
Basic and diluted net loss per share (in dollars per share) $ (0.23)   $ (0.08)   $ (0.58) $ (0.53)