Note 2 - Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	YEAR ENDED SEPTEMBER 30,
	2023		2022
Oil and Gas Markets
Traditional exploration product revenue	$	12,081	$	6,558
Wireless exploration product revenue		10,168		15,822
Reservoir product revenue		962		1,968
Total revenue		23,211		24,348
Adjacent Markets
Industrial product revenue		36,859		25,640
Imaging product revenue		12,029		13,360
Total revenue		48,888		39,000
Emerging Markets
Revenue		1,234		711
Corporate
Revenue		—		50
Total	$	73,333	$	64,109

Revenue from External Customers by Geographic Areas [Table Text Block]

	YEAR ENDED SEPTEMBER 30,
	2023		2022
Asia (including Russian Federation)	$	13,006	$	10,978
Canada		1,032		890
Europe		5,976		15,705
South America		448		719
United States		49,828		33,778
Other		3,043		2,039
	$	73,333	$	64,109