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Note 15 - Stock Plans - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Oct. 31, 2016 $ / shares shares
Lower limit exercise price (in dollars per share)	$ 1.54
Upper limit exercise price (in dollars per share)	$ 23.91
Number outstanding (in shares) | shares	7,373,951
Weighted-average exercise price - outstanding (in dollars per share)	$ 4.03
Weighted-average remaining contractual life - outstanding (Year)	5 years
Number exercisable (in shares) | shares	5,071,181
Weighted-average exercise price - exercisable (in dollars per share)	$ 4.31
Weighted-average remaining contractual life - exercisable (Year)	3 years 208 days
Range One [Member]
Lower limit exercise price (in dollars per share)	$ 1.54
Upper limit exercise price (in dollars per share)	$ 5
Number outstanding (in shares) | shares	5,595,326
Weighted-average exercise price - outstanding (in dollars per share)	$ 2.81
Weighted-average remaining contractual life - outstanding (Year)	5 years 127 days
Number exercisable (in shares) | shares	3,915,056
Weighted-average exercise price - exercisable (in dollars per share)	$ 3
Weighted-average remaining contractual life - exercisable (Year)	3 years 324 days
Range Two [Member]
Lower limit exercise price (in dollars per share)	$ 5.01
Upper limit exercise price (in dollars per share)	$ 10
Number outstanding (in shares) | shares	1,601,750
Weighted-average exercise price - outstanding (in dollars per share)	$ 6.36
Weighted-average remaining contractual life - outstanding (Year)	4 years 109 days
Number exercisable (in shares) | shares	979,250
Weighted-average exercise price - exercisable (in dollars per share)	$ 6.42
Weighted-average remaining contractual life - exercisable (Year)	2 years 299 days
Range Three [Member]
Lower limit exercise price (in dollars per share)	$ 10.01
Upper limit exercise price (in dollars per share)	$ 20
Number outstanding (in shares) | shares
Weighted-average remaining contractual life - outstanding (Year)
Number exercisable (in shares) | shares
Weighted-average exercise price - exercisable (in dollars per share)
Weighted-average remaining contractual life - exercisable (Year)
Range Four [Member]
Lower limit exercise price (in dollars per share)	$ 20.01
Upper limit exercise price (in dollars per share)	$ 30
Number outstanding (in shares) | shares	176,875
Weighted-average exercise price - outstanding (in dollars per share)	$ 21.68
Weighted-average remaining contractual life - outstanding (Year)	211 days
Number exercisable (in shares) | shares	176,875
Weighted-average exercise price - exercisable (in dollars per share)	$ 21.68
Weighted-average remaining contractual life - exercisable (Year)	211 days

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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