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Note 15 - Stock Plans - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Oct. 31, 2020 $ / shares shares
Lower limit exercise price (in dollars per share)	$ 7.85
Upper limit exercise price (in dollars per share)	157.00
Range One [Member]
Lower limit exercise price (in dollars per share)
Upper limit exercise price (in dollars per share)
Number outstanding (in shares) | shares	108,150
Weighted-average exercise price - outstanding (in dollars per share)	$ 9.65
Weighted-average remaining contractual life - outstanding (Year)	8 years 6 months 29 days
Number exercisable (in shares) | shares	850
Weighted-average exercise price - exercisable (in dollars per share)	$ 24.08
Weighted-average remaining contractual life - exercisable (Year)	3 years 3 months
Range Two [Member]
Lower limit exercise price (in dollars per share)
Upper limit exercise price (in dollars per share)
Number outstanding (in shares) | shares	96,995
Weighted-average exercise price - outstanding (in dollars per share)	$ 50.07
Weighted-average remaining contractual life - outstanding (Year)	3 years 9 months 3 days
Number exercisable (in shares) | shares	82,557
Weighted-average exercise price - exercisable (in dollars per share)	$ 50.31
Weighted-average remaining contractual life - exercisable (Year)	3 years 2 months 12 days
Range Three [Member]
Lower limit exercise price (in dollars per share)
Upper limit exercise price (in dollars per share)
Number outstanding (in shares) | shares	57,300
Weighted-average exercise price - outstanding (in dollars per share)	$ 67.66
Weighted-average remaining contractual life - outstanding (Year)	4 years 1 month 9 days
Number exercisable (in shares) | shares	35,200
Weighted-average exercise price - exercisable (in dollars per share)	$ 71.46
Weighted-average remaining contractual life - exercisable (Year)	1 year 11 months 12 days
Range Four [Member]
Lower limit exercise price (in dollars per share)
Upper limit exercise price (in dollars per share)
Number outstanding (in shares) | shares	26,946
Weighted-average exercise price - outstanding (in dollars per share)	$ 142.17
Weighted-average remaining contractual life - outstanding (Year)	2 years 9 months 3 days
Number exercisable (in shares) | shares	26,946
Weighted-average exercise price - exercisable (in dollars per share)	$ 142.17
Weighted-average remaining contractual life - exercisable (Year)	2 years 9 months 3 days
Range Five [Member]
Number outstanding (in shares) | shares	289,391
Weighted-average exercise price - outstanding (in dollars per share)	$ 47.02
Weighted-average remaining contractual life - outstanding (Year)	5 years 6 months 14 days
Number exercisable (in shares) | shares	145,553
Weighted-average exercise price - exercisable (in dollars per share)	$ 72.28
Weighted-average remaining contractual life - exercisable (Year)	2 years 9 months 21 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://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=120381028&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

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-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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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

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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

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