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Note 2 - Business Acquisition - Unaudited Pro Forma Financial Information (Details) - Microlab/FXR LLC [Member] - USD ($) | 3 Months Ended | 6 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021
Revenue | $ 22,559 | $ 14,869 | $ 44,527 | $ 27,988
Net income | $ 429 | $ 5,146 | $ 739 | $ 4,666
Basic (in dollars per share) | $ 0.04 | $ 0.52 | $ 0.07 | $ 0.47
Diluted (in dollars per share) | $ 0.04 | $ 0.51 | $ 0.07 | $ 0.46

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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