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Note 10 - Business and Credit Concentrations, Major Customers and Geographic Information (Details Textual) $ in Millions | 12 Months Ended
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Oct. 31, 2022 USD ($) | Oct. 31, 2021 USD ($) | Oct. 31, 2020 USD ($)
Customer One [Member] |  |  |
Revenues, Total | $ 11.8 | $ 11.3 | $ 9.7
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Concentration Risk, Number of Customers | 1 | 1 | 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage | 17.00% | 19.10% | 17.60%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage | 11.20% | 9.50% | 11.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member] |  |  |
Concentration Risk, Percentage | 7.50% |  | 5.10%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |  |
Concentration Risk, Percentage | 85.00% | 82.00% | 81.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member] |  |  |
Concentration Risk, Percentage | 15.00% | 18.00% | 19.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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