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Note 15 - Stock Plans (Details Textual) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2019 USD ($) $ / shares shares	Oct. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	110,975	37,825
Share-based Payment Arrangement, Expense \| $	$ 2,800	$ 700	$ 3,700
Share-based Payment Arrangement, Expense, after Tax \| $	$ 2,600		$ 2,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Installments	4
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	0	0	1,210
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) \| $ / shares	$ 7.85
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) \| $ / shares	$ 157.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $			$ 26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares		$ 4.46	$ 27.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share) \| $ / shares		$ 36.07	$ 69.56
Share-based Compensation Arrangement by Share-based Payment Award, Participants Years of Service (Year)	15 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	200,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 6,200
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 9 months 18 days
Nonemployee Director [Member]
Number of Directors				5
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense \| $	$ 400	$ 800	$ 700
Restricted Stock [Member]
Share-based Compensation, Reverse of Previously Recognized Expense \| $	$ 2,400	$ 2,600	$ 800
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)	142,231	107,650	20,292
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	5,567	656
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options Vested, Number (in shares)	60,446	33,643	21,609
Restricted Stock [Member] \| Prior Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)	11,503	8,380	5,936
Restricted Stock [Member] \| Participants With Service Requirement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Participants Age (Year)	58 years
Restricted Stock [Member] \| Nonemployee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Installments	3
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)	36,731	103,612	15,904
Restricted Stock [Member] \| Participants Without Service Requirement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Participants Age (Year)	60 years
Awards Other Than Options [Member]
Share-based Payment Arrangement, Noncash Expense, Total \| $	$ 2,400		$ 2,800
Share-based Payment Arrangement, Noncash Income \| $		$ 200
Performance-based Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.19%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	108.15%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	142,500	81,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		56,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Adjustment for Shares Grants in Previous Period (in shares)	20,350
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Time-based Market Share Units [Member]
Share-based Compensation, Reverse of Previously Recognized Expense \| $	$ 2,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)		81,850
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		56,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Adjustment for Shares Grants in Previous Period (in shares)	16,700
Market Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Installments	4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0
Share-based Compensation Arrangement By Share-based Compensation Award Fair Value Measurement Period (Day)	60 days
Market Stock Units [Member] \| Two Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		62.51%	48.41%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%
Market Stock Units [Member] \| Two and a Half Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		1.80%	2.56%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		59.60%	51.92%
Market Stock Units [Member] \| Three Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		57.04%	56.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Market Stock Units [Member] \| Four Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		1.81%	2.68%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		60.03%	52.59%
Market Stock Units [Member] \| Five Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		56.86%	49.57%
Market Stock Units [Member] \| Minimum [Member]
Percentage of Target Number of Shares Covered by MSU Awards	0.00%
Market Stock Units [Member] \| Maximum [Member]
Percentage of Target Number of Shares Covered by MSU Awards	200.00%
Performance Based MSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Installments	4
Performance Based MSUs [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		1.99%	2.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		0.56%	0.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)		7 years 11 months 23 days	8 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate		7.84%	9.90%