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Note 15 - Stock Plans - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Oct. 31, 2021 $ / shares shares
Lower limit exercise price (in dollars per share)	$ 7.85
Upper limit exercise price (in dollars per share)	$ 157.00
Number outstanding (in shares) | shares	206,234
Weighted-average exercise price - outstanding (in dollars per share)	$ 51.67
Weighted-average remaining contractual life - outstanding (Year)	4 years 10 months 24 days
Range One [Member]
Lower limit exercise price (in dollars per share)	$ 7.85
Upper limit exercise price (in dollars per share)	$ 38.75
Number outstanding (in shares) | shares	74,387
Weighted-average exercise price - outstanding (in dollars per share)	$ 9.51
Weighted-average remaining contractual life - outstanding (Year)	7 years 6 months 21 days
Number exercisable (in shares) | shares	19,464
Weighted-average exercise price - exercisable (in dollars per share)	$ 9.52
Weighted-average remaining contractual life - exercisable (Year)	7 years 4 months 20 days
Range Two [Member]
Lower limit exercise price (in dollars per share)	$ 42.50
Upper limit exercise price (in dollars per share)	$ 63.75
Number outstanding (in shares) | shares	74,701
Weighted-average exercise price - outstanding (in dollars per share)	$ 54.14
Weighted-average remaining contractual life - outstanding (Year)	5 years 25 days
Number exercisable (in shares) | shares	48,918
Weighted-average exercise price - exercisable (in dollars per share)	$ 51.74
Weighted-average remaining contractual life - exercisable (Year)	4 years 3 months 18 days
Range Three [Member]
Lower limit exercise price (in dollars per share)	$ 66.75
Upper limit exercise price (in dollars per share)	$ 100.25
Number outstanding (in shares) | shares	32,500
Weighted-average exercise price - outstanding (in dollars per share)	$ 71.60
Weighted-average remaining contractual life - outstanding (Year)	8 months 26 days
Number exercisable (in shares) | shares	32,500
Weighted-average exercise price - exercisable (in dollars per share)	$ 71.60
Weighted-average remaining contractual life - exercisable (Year)	8 months 26 days
Range Four [Member]
Lower limit exercise price (in dollars per share)	$ 110.25
Upper limit exercise price (in dollars per share)	$ 157.00
Number outstanding (in shares) | shares	24,646
Weighted-average exercise price - outstanding (in dollars per share)	$ 145.15
Weighted-average remaining contractual life - outstanding (Year)	1 year 9 months 29 days
Number exercisable (in shares) | shares	24,646
Weighted-average exercise price - exercisable (in dollars per share)	$ 145.15
Weighted-average remaining contractual life - exercisable (Year)	1 year 9 months 29 days
Range Five [Member]
Number exercisable (in shares) | shares	125,528
Weighted-average exercise price - exercisable (in dollars per share)	$ 68.68
Weighted-average remaining contractual life - exercisable (Year)	3 years 4 months 13 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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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.

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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.

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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.

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