Note 2 - Revenue Recognition (Tables)

9 Months Ended

Jun. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Nine Months Ended
	June 30, 2023		June 30, 2022		June 30, 2023		June 30, 2022
Oil and Gas Markets
Traditional exploration product revenue	$	3,363	$	1,592	$	9,414	$	3,389
Wireless exploration product revenue		907		100		8,077		14,358
Reservoir product revenue		523		692		810		1,513
Total revenue		4,793		2,384		18,301		19,260
Adjacent Markets
Industrial product revenue		11,678		7,465		29,250		18,471
Imaging product revenue		3,147		3,429		9,032		9,708
Total revenue		14,825		10,894		38,282		28,179
Emerging Markets
Revenue		109		135		393		571
Corporate
Revenue		—		50		—		50
Total	$	19,727	$	13,463	$	56,976	$	48,060

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

	Three Months Ended				Nine Months Ended
	June 30, 2023		June 30, 2022		June 30, 2023		June 30, 2022
Asia (including Russian Federation)	$	3,287	$	1,223	$	11,264	$	7,580
Canada		85		577		1,179		1,634
Europe		1,856		1,625		4,782		14,368
United States		13,481		9,297		37,551		22,621
Other		1,018		741		2,200		1,857
Total	$	19,727	$	13,463	$	56,976	$	48,060