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Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Jul. 16, 2021 | Jun. 15, 2021 | Mar. 04, 2021 | Jan. 12, 2021 | Dec. 31, 2020 | Sep. 15, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | Jan. 09, 2020 | Dec. 06, 2019 | Nov. 04, 2019 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 5 months 23 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 7 months 2 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 5 months 23 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  | $ 2,729,000 |  | $ 2,729,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  | 1,221,000 |  | 1,221,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  | 2,713,000 |  | 2,713,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | 374,000 | $ 166,000 | 634,000 | $ 449,000
Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonemployee Director, Annual Compensation |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  | $ 50,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Director (in shares) |  |  |  |  |  |  |  |  |  |  | 3,270 |  |  | 5,757 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  | $ 25,000 |
Share Price, 20 Day Average (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 6.36 | $ 4.34 |  | $ 4.34 |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.38 | $ 3.06
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  |  |  |  |  | $ 587,000 |  | $ 587,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 10 months 9 days |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  |  |  |  |  | 311,000 |  | $ 311,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 13 days |
One Employee [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  | 10,000 |  | 50,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares) |  |  |  |  |  |  |  | 2,500 |  | 10,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares) |  |  |  |  |  |  |  | 2,500 |  | 10,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 3 years |  | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  | 10 years |  | 10 years |  |  |  |  |
Three Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  |  | 12,075 |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | $ 77,000 |  |  |  |  |  |
Two Employees [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 3,241 |  |  |  |  |  |
Five Employees [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 77,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Five Employees [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  | 38,500 |  |  |  |  |  |
Five Employees [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 9, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Five Employees [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting Quarterly After January 9, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
One Manager and Three Officers [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 67,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
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 (in shares) |  |  |  | 33,500 |  |  |  |  |  |  |  |  |  |  |
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 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 Quarterly After January 12, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Director [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Director (in shares) |  |  |  |  | 3,334 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |
Share Price, 20 Day Average (in dollars per share) |  |  |  |  | $ 5.31 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Nonemployee Service Period upon Joining the Board (Month) |  |  |  |  | 8 months 15 days |  |  |  |  |  |  |  |  |  |
Non-employee Directors and Chairperson of Committee on Board [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price, 20 Day Average (in dollars per share) |  |  |  |  |  | $ 4.34 |  |  |  |  |  |  |  |  |
Annual Payable, Cash, Additional Compensation |  |  |  |  |  |  |  |  |  |  |  | $ 15,000 |  | $ 15,000 |
Stock Issued During Period, Shares, Per Person, Issued For Services (in shares) |  |  |  |  |  | 3,454 | 279 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  |  | $ 4.47 |  |  |  |  |  | $ 4.47 |  | $ 4.47
Annual Payable, Shares, Additional Compensation |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |
Director [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value |  | $ 15,000 | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Share Price, 20 Day Average (in dollars per share) |  | $ 7.56 | $ 6.04 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Nonemployee Service Period upon Joining the Board (Month) |  | 3 months | 6 months 15 days |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) |  | 496 | 1,344 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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