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Note 8 - Concentrations of Credit Risk (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Cash, Uninsured Amount | $ 12.5 |  | $ 12.5 |
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributors One [Member] |  |  |  |
Concentration Risk, Percentage | 11.00% | 28.00% | 11.00% | 32.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributors Two [Member] |  |  |  |
Concentration Risk, Percentage | 17.00% |  | 14.00% |
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier One [Member] |  |  |  |
Concentration Risk, Percentage |  | 14.00% | 11.00% |
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors One [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 14.00% | 18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors Two [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 19.00% | 15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier One [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier Two [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 21.00%

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