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Note 9 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Goodwill, Gross $ 13,251   $ 13,251   $ 10,282
Goodwill, Acquired During Period     2,923   0
Goodwill, Impairment Loss         $ 0
Amortization of Intangible Assets $ 619 $ 526 1,239 $ 1,058  
Genasys Spain [Member]          
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)     51    
Evertel Technologies, LLC [Member]          
Goodwill, Acquired During Period     $ 2,923