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Note 15 - Stock Plans - Stock Options Outstanding and Exercisable (Details) | 12 Months Ended
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Oct. 31, 2018 $ / shares shares
Lower limit exercise price (in dollars per share) | $ 1.54
Upper limit exercise price (in dollars per share) | $ 6.28
Number outstanding (in shares) | shares | 6,964,326
Weighted-average exercise price - outstanding (in dollars per share) | $ 2.95
Weighted-average remaining contractual life - outstanding (Year) | 4 years 160 days
Number exercisable (in shares) | shares | 4,793,490
Weighted-average exercise price - exercisable (in dollars per share) | $ 3.29
Weighted-average remaining contractual life - exercisable (Year) | 2 years 222 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 | 2,645,784
Weighted-average exercise price - outstanding (in dollars per share) | $ 2
Weighted-average remaining contractual life - outstanding (Year) | 6 years 116 days
Number exercisable (in shares) | shares | 1,108,534
Weighted-average exercise price - exercisable (in dollars per share) | $ 1.97
Weighted-average remaining contractual life - exercisable (Year) | 3 years 237 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 | 3,004,042
Weighted-average exercise price - outstanding (in dollars per share) | $ 2.77
Weighted-average remaining contractual life - outstanding (Year) | 3 years 208 days
Number exercisable (in shares) | shares | 2,370,456
Weighted-average exercise price - exercisable (in dollars per share) | $ 2.81
Weighted-average remaining contractual life - exercisable (Year) | 2 years 32 days
Range Three [Member] |
Lower limit exercise price (in dollars per share) | $ 4.42
Upper limit exercise price (in dollars per share) | $ 6.28
Number outstanding (in shares) | shares | 1,314,500
Weighted-average exercise price - outstanding (in dollars per share) | $ 5.27
Weighted-average remaining contractual life - outstanding (Year) | 2 years 240 days
Number exercisable (in shares) | shares | 1,314,500
Weighted-average exercise price - exercisable (in dollars per share) | $ 5.27
Weighted-average remaining contractual life - exercisable (Year) | 2 years 240 days

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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