Note 2 - Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2024

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Six Months Ended
	March 31, 2024		March 31, 2023		March 31, 2024		March 31, 2023
Oil and Gas Markets
Traditional exploration product revenue	$	3,472	$	3,296	$	5,234	$	6,051
Wireless exploration product revenue		2,679		1,411		34,548		7,170
Reservoir product revenue		41		132		114		287
Total revenue		6,192		4,839		39,896		13,508
Adjacent Markets
Industrial product revenue		9,023		9,642		15,466		17,572
Imaging product revenue		3,169		3,029		6,502		5,885
Total revenue		12,192		12,671		21,968		23,457
Emerging Markets
Revenue		1,113		191		1,347		284
Total	$	19,497	$	17,701	$	63,211	$	37,249

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

	Three Months Ended				Six Months Ended
	March 31, 2024		March 31, 2023		March 31, 2024		March 31, 2023
Asia (including Russian Federation)	$	3,672	$	1,443	$	35,888	$	7,977
Canada		1,002		333		2,228		1,094
Europe		1,507		1,792		2,885		2,926
United States		12,831		13,479		21,249		24,070
Other		485		654		961		1,182
Total	$	19,497	$	17,701	$	63,211	$	37,249