Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Goodwill, Acquired During Period			$ 0
Goodwill, Ending Balance	$ 23,511		23,511		$ 23,834
Goodwill, Impairment Loss			0	$ 0
Amortization of Intangible Assets	$ 537	$ 295	1,621	647
Genasys Spain [Member]
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)			$ (295)
Zonehaven, Inc and Asset Acquisition of Amika Mobile Corporation [Member]
Goodwill, Acquired During Period					$ 21,128
Assets Acquisition of Amika Mobile Corporation [Member]
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)				$ 113