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Note 15 - Stock Plans (Details) - Stock Options Outstanding and Exercisable
12 Months Ended
Oct. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price $ 1.66
Upper limit exercise price $ 32.33
Number outstanding (in Shares) | shares 6,393,876
Weighted-average exercise price - outstanding $ 4.78
Weighted-average remaining contractual life - oustanding 5 years 65 days
Number exercisable (in Shares) | shares 4,566,290
Weighted-average exercise price - exercisable $ 4.96
Weighted-average remaining contractual life - exercisable 4 years 94 days
Range One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price $ 1.66
Upper limit exercise price $ 5.00
Number outstanding (in Shares) | shares 4,515,001
Weighted-average exercise price - outstanding $ 3.03
Weighted-average remaining contractual life - oustanding 5 years 135 days
Number exercisable (in Shares) | shares 3,432,415
Weighted-average exercise price - exercisable $ 3.04
Weighted-average remaining contractual life - exercisable 4 years 270 days
Range Two [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price $ 5.01
Upper limit exercise price $ 10.00
Number outstanding (in Shares) | shares 1,611,750
Weighted-average exercise price - outstanding $ 6.36
Weighted-average remaining contractual life - oustanding 5 years 105 days
Number exercisable (in Shares) | shares 866,750
Weighted-average exercise price - exercisable $ 6.44
Weighted-average remaining contractual life - exercisable 3 years 102 days
Range Three [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price $ 10.01
Upper limit exercise price 20.00
Range Four [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price 20.01
Upper limit exercise price $ 30.00
Number outstanding (in Shares) | shares 187,375
Weighted-average exercise price - outstanding $ 21.78
Weighted-average remaining contractual life - oustanding 1 year 215 days
Number exercisable (in Shares) | shares 187,375
Weighted-average exercise price - exercisable $ 21.78
Weighted-average remaining contractual life - exercisable 1 year 215 days
Range Five [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower limit exercise price $ 30.01
Upper limit exercise price $ 40.00
Number outstanding (in Shares) | shares 79,750
Weighted-average exercise price - outstanding $ 32.33
Weighted-average remaining contractual life - oustanding 200 days
Number exercisable (in Shares) | shares 79,750
Weighted-average exercise price - exercisable $ 32.33
Weighted-average remaining contractual life - exercisable 200 days