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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% |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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