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Note 15 - Stock Plans - Stock Options Outstanding and Exercisable (Details)
 12 Months Ended
Oct. 31, 2017
$ / shares
shares
Lower limit exercise price (in dollars per share) $ 1.54
Upper limit exercise price (in dollars per share) $ 6.46
Number outstanding (in shares) | shares 6,860,701
Weighted-average exercise price - outstanding (in dollars per share) $ 3.41
Weighted-average remaining contractual life - outstanding (Year) 4 years 80 days
Number exercisable (in shares) | shares 5,259,011
Weighted-average exercise price - exercisable (in dollars per share) $ 3.69
Weighted-average remaining contractual life - exercisable (Year) 2 years 350 days
Range One [Member]  
Lower limit exercise price (in dollars per share) $ 1.54
Upper limit exercise price (in dollars per share) $ 2.41
Number outstanding (in shares) | shares 2,320,409
Weighted-average exercise price - outstanding (in dollars per share) $ 2.01
Weighted-average remaining contractual life - outstanding (Year) 6 years 259 days
Number exercisable (in shares) | shares 1,003,714
Weighted-average exercise price - exercisable (in dollars per share) $ 2
Weighted-average remaining contractual life - exercisable (Year) 4 years 7 days
Range Two [Member]  
Lower limit exercise price (in dollars per share) $ 2.42
Upper limit exercise price (in dollars per share) $ 4.41
Number outstanding (in shares) | shares 2,496,542
Weighted-average exercise price - outstanding (in dollars per share) $ 2.84
Weighted-average remaining contractual life - outstanding (Year) 3 years 94 days
Number exercisable (in shares) | shares 2,322,797
Weighted-average exercise price - exercisable (in dollars per share) $ 2.77
Weighted-average remaining contractual life - exercisable (Year) 2 years 350 days
Range Three [Member]  
Lower limit exercise price (in dollars per share) $ 4.42
Upper limit exercise price (in dollars per share) $ 6.46
Number outstanding (in shares) | shares 2,043,750
Weighted-average exercise price - outstanding (in dollars per share) $ 5.70
Weighted-average remaining contractual life - outstanding (Year) 2 years 208 days
Number exercisable (in shares) | shares 1,932,500
Weighted-average exercise price - exercisable (in dollars per share) $ 5.66
Weighted-average remaining contractual life - exercisable (Year) 2 years 146 days