Note 2 - Revenue Recognition (Tables)

3 Months Ended

Dec. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
	December 31, 2023		December 31, 2022
Oil and Gas Markets
Traditional exploration product revenue	$	1,762	$	2,755
Wireless exploration product revenue		31,869		5,759
Reservoir product revenue		73		155
Total revenue		33,704		8,669
Adjacent Markets
Industrial product revenue		6,443		7,930
Imaging product revenue		3,333		2,856
Total revenue		9,776		10,786
Emerging Markets
Revenue		234		93
Total	$	43,714	$	19,548

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

	Three Months Ended
	December 31, 2023		December 31, 2022
Asia (including Russian Federation)	$	32,216	$	6,534
Canada		1,226		761
Europe		1,378		1,134
United States		8,418		10,591
Other		476		528
Total	$	43,714	$	19,548