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Note 9 - Stock Options (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2022 | Jan. 10, 2022 | Jul. 16, 2021 | Jan. 12, 2021 | Oct. 31, 2022 | Oct. 31, 2021 | Sep. 08, 2021 | Sep. 15, 2020 | Jul. 22, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  | 6 years 7 months 9 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  | 5 years 10 months 28 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  | 6 years 7 months 13 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  | $ 518,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  | 265,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  | 513,000 |  |  |  |
Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |
Nonemployee Director, Annual Compensation |  |  |  |  |  |  | $ 50,000 |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 594,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 11 months 12 days |  |  |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 39,000 |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 685,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years 2 months 8 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] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 106,001 |  | 67,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  | 10 years |  | 10 years |  |  |  |  |
One Manager and Three Officers [Member] | 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] | Incentive Stock Options [Member] | Vesting Quarterly After January 12, 2022 [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |  |
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 (Year) |  | 4 years |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
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 (Year) |  |  | 10 years |  |  |  |  |  |
One Employee [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 12,000 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 3,000 |  |  |  |  |  |  |  |
Three Employees [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 5,000 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 2 years |  |  |  |  |  |  |  |
Incentive Stock Options [Member] | Three Employees [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |
Two Employees [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 6,000 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |
Non-employee Directors and Chairman of the Board [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 Nominating & Governance Chair [Member] |  |  |  |  |  |  |  |  |
Annual Payable, Additional Compensation |  |  |  |  |  |  | $ 10,000 |  |
Non-employee Directors and Chairperson of Committee on Board [Member] |  |  |  |  |  |  |  |  |
Share Price, 20 Day Average (in dollars per share) |  |  |  |  |  |  |  | $ 8.21 |
The 2020 Plan [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  | 1,250,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 916,369 |  |  |

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