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Note 7 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details) - $ / shares
9 Months Ended
Jul. 31, 2020
Outstanding, shares (in shares) 890,147
Outstanding, weighted average exercise price (in dollars per share) $ 3.62
Options granted, shares (in shares) 140,241
Options granted, weighted average exercise price (in dollars per share) $ 6.40
Options exercised, shares (in shares) (241,209)
Options exercised, weighted average exercise price (in dollars per share) $ 1.85
Options outstanding, shares (in shares) 789,179
Options outstanding, weighted average exercise price (in dollars per share) $ 4.66
Options exercisable, shares (in shares) 459,513
Options exercisable, weighted average exercise price (in dollars per share) $ 4.48
Options vested and expected to vest, shares (in shares) 788,143
Options vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.67