Note 2 - Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Six Months Ended
	March 31, 2023		March 31, 2022		March 31, 2023		March 31, 2022
Oil and Gas Markets
Traditional exploration product revenue	$	3,296	$	1,217	$	6,051	$	1,797
Wireless exploration product revenue		1,411		10,500		7,170		14,258
Reservoir product revenue		132		394		287		821
Total revenue		4,839		12,111		13,508		16,876
Adjacent Markets
Industrial product revenue		9,642		5,993		17,572		11,006
Imaging product revenue		3,029		3,162		5,885		6,279
Total revenue		12,671		9,155		23,457		17,285
Emerging Markets
Revenue		191		299		284		436
Total	$	17,701	$	21,565	$	37,249	$	34,597

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

	Three Months Ended				Six Months Ended
	March 31, 2023		March 31, 2022		March 31, 2023		March 31, 2022
Asia	$	1,443	$	1,679	$	7,977	$	6,357
Canada		333		659		1,094		1,057
Europe		1,792		11,432		2,926		12,743
United States		13,479		7,305		24,070		13,324
Other		654		490		1,182		1,116
Total	$	17,701	$	21,565	$	37,249	$	34,597