Note 10 - Segment Information - Summarizes Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue	$ 27,466	$ 35,167
Long-Lived Assets	5,485	5,585
UNITED STATES
Revenue	15,309	18,114
Long-Lived Assets	3,876	3,555
Europe and Middle East [Member]
Revenue	6,341	6,732
Long-Lived Assets	565	1,234
Asia [Member]
Revenue	5,030	9,291
Long-Lived Assets	1,044	796
Other [Member]
Revenue	786	1,030
Long-Lived Assets	$ 0	$ 0