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Note 8 - Net Income (Loss) Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Net income (loss) (numerator) $ 1,390,865 $ (239,082) $ 980,730 $ (854,849)
Shares (denominator) (in shares) 7,675,129 6,488,328 7,489,843 6,520,582
Basic and diluted net income (loss) per share (in dollars per share) $ 0.18 $ (0.04) $ 0.13 $ (0.13)