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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 9 Months Ended
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Net loss (numerator) $ (1,433,830) $ (1,689,181) $ (2,591,888) $ (1,085,294) $ (617,425) $ (3,310,020) $ (5,714,899) $ (5,012,739)
Shares (denominator) (in shares) 7,352,673     7,319,274     7,354,579 7,409,465
Basic and diluted net loss per share (in dollars per share) $ (0.20)     $ (0.15)     $ (0.78) $ (0.68)