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Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 09, 2020 | Dec. 06, 2019 | Nov. 04, 2019 | Mar. 08, 2019 | Dec. 03, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  | 5 years 193 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  | 3 years 211 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  | 5 years 189 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  | $ 1,224,000 |  | $ 1,224,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  | 719,000 |  | 719,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  |  | 1,216,000 |  | 1,216,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 96,000 | $ 78,000 | 283,000 | $ 192,000
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, Value |  |  | $ 25,000 |  |  |  |  |  |
Share Price, 20 Day Average (in dollars per share) |  |  | $ 6.36 |  |  |  |  |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  | $ 3.13 | $ 4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | 713,000 |  | $ 713,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 4 years 153 days |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 284,000 |  | $ 284,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 1 year 146 days |
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 (in shares) |  |  | 3,270 |  |  |  |  |  |
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 |  |  |  | 25,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares) |  |  |  |  | 5,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares) |  |  |  |  | 5,000 |  |  |  |
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 |  |  |  |
One Employee [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 50,000 |  | 25,000 | 10,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares) |  | 10,000 |  | 5,000 | 2,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares) |  | 10,000 |  | 5,000 | 2,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years |  | 4 years | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |  | 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 |  |  |  |  |  |  |  |
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, Equity Instruments Other than Options, Grants in Period (in shares) | 38,500 |  |  |  |  |  |  |  |
Five Employees [Member] | Restricted Stock and Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |

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