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Note 8 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details)
 3 Months Ended
Jan. 31, 2023
$ / shares
shares
Outstanding (in shares) 691,005
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 5.87
Options granted (in shares) 158,181
Options granted, weighted average exercise price (in dollars per share) | $ / shares $ 5.46
Options exercised (in shares) (45,000)
Options exercised, weighted average exercise price (in dollars per share) | $ / shares $ 1.90
Options cancelled (in shares) 0
Options outstanding (in shares) 804,186
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.01
Options exercisable (in shares) 385,216
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 6.69
Options vested and expected to vest (in shares) 798,697
Options vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 6.02