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Note 9 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Oct. 02, 2020 | Jun. 07, 2020
Goodwill, Acquired During Period | $ 21,128 |  |  |
Goodwill, Ending Balance | 23,834 | $ 2,472 |  |
Goodwill, Impairment Loss | 0 | $ 0 |  |
Finite-lived Intangible Assets Acquired | 12,920 |  |  |
Genasys Spain [Member] |  |  |  |
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss) | (32) |  |  |
Zonehaven, Inc and Asset Acquisition of Amika Mobile Corporation [Member] |  |  |  |
Goodwill, Acquired During Period | 21,128 |  |  |
Finite-lived Intangible Assets Acquired | 13,052 |  |  |
Assets Acquisition of Amika Mobile Corporation [Member] |  |  |  |
Goodwill, Ending Balance |  |  | $ 5,590 | $ 15,538
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss) | $ 398 |  |  |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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