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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Impairment of goodwill | $ 13,162 | $ 0
Goodwill, Gross | 10,118 | $ 23,834
Assets Acquisition of Amika Mobile Corporation [Member] |  |
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss) | (241) |
Genasys Spain [Member] |  |
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss) | (458) |
Software [Member] |  |
Impairment of goodwill | $ 13,162 |

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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 55 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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