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Note 1 - Business Activities and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022
Goodwill, Impairment Loss | $ 0 | $ 0 |
Goodwill | 8,084,569 | 8,085,000 |
Asset Impairment Charges | 0 | 0 |
Amortization of Intangible Assets, Total | 1,688,000 | 1,701,000 |
Advertising Expense | 361,000 | 76,000 |
Research and Development Expense | 2,782,000 | 3,151,000 | $ 3,151,000
Stock-based compensation expense | $ 924,000 | $ 898,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 874,816 | 811,135 |
Trademarks [Member] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 0 | $ 0 |
Microlab/FXR LLC [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 19,800,000 |  |
Goodwill | 5,600,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 10,300,000 |  |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Weighted Average [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 7 years 7 months 13 days |  |

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