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Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2022 | Jan. 10, 2022 | Sep. 08, 2021 | Jul. 16, 2021 | Jan. 12, 2021 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2022 | Jul. 31, 2021 | Sep. 15, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  | 6 years 10 months 9 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  | 6 years 1 month 13 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  | 6 years 10 months 13 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  | $ 992,000 |  | $ 992,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  | 497,000 |  | 497,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  |  | 984,000 |  | 984,000 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | 191,000 | $ 374,000 | 498,000 | $ 634,000 |
Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |
Nonemployee Director, Annual Compensation |  |  | $ 50,000 |  |  |  |  |  |  | $ 50,000
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 442,000 |  | $ 442,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 1 year 3 months 25 days |  |  |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 39,000 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  | $ 3.77 | $ 3.38 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 778,000 |  | $ 778,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 2 years 4 months 20 days |  |  |  |
One Manager and Three Officers [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 39,666 |  |  | 33,500 |  |  |  |  |
One Manager and Three Officers [Member] | One Manager and Three Officers [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 106,001 |  |  | 67,000 |  |  |  |  |
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  | 4 years |  |  | 4 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  |  | 10 years |  |  |  |  |
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 12, 2022 [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |  |  |  |  |
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 10, 2023 [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  | 25.00% |  |  |  |  |  |  |  |
One Manager and Three Officers [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  | 10 years |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  | 50,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  | 10 years |  |  |  |  |  |
Non-employee Directors and Chairperson of Committee on Board [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  |  |  |  |  |  |  |  | $ 15,000
Share Price, 20 Day Average (in dollars per share) |  |  | $ 8.21 |  |  |  |  |  |  | $ 4.34
Non-employee Directors and Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  | $ 25,000 |  |  |  |  |  |  |
Non-employee Directors and Audit Committee Chair [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  | 25,000 |  |  |  |  |  |  |
Non-employee Directors and Compensation Committee Chair [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  | 20,000 |  |  |  |  |  |  |
Non-employee Directors and Strategic Planning and Capital Allocation Chair [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  | 20,000 |  |  |  |  |  |  |
Non-employee Directors and Nominating & Governance Chair [Member] |  |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  | $ 10,000 |  |  |  |  |  |  |
Mr. Holdsworth [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 5,785 |  |  |  |  |  |  |
Ms. Cefali [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 4,871 |  |  |  |  |  |  |
Mr. Garland [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 4,567 |  |  |  |  |  |  |
Mr. Fink [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 3,044 |  |  |  |  |  |  |

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