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Note 15 - Stock Plans - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Options outstanding at beginning of period (in shares)	331,481	278,569	274,423
Options outstanding at beginning of period (in dollars per share)	$ 53.93	$ 73.76	$ 85.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	110,975	37,825
Granted (in dollars per share)	$ 0	$ 9.44	$ 56.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	0	0	1,210
Exercised (in dollars per share)	$ 0	$ 0	$ 49.91
Forfeited (in shares)	6,560	2,038	2,000
Forfeited (in dollars per share)	$ 26.24	$ 53.96	$ 64.25
Expired (in shares)	35,530	56,025	30,469
Expired (in dollars per share)	$ 115.28	$ 64.41	$ 156.95
Options outstanding at end of period (in shares)	289,391	331,481	278,569
Options outstanding at end of period (in dollars per share)	$ 47.02	$ 53.93	$ 73.76
Options exercisable at end of period (in shares)	145,553	147,019	191,748

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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