Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total revenue	$ 50,032	$ 31,109
Product [Member]
Total revenue	43,714	19,548
Operating Segments [Member] | Oil and Gas Markets [Member]
Total revenue	39,909	20,148
Operating Segments [Member] | Oil and Gas Markets [Member] | Traditional Exploration Product Revenue [Member]
Total revenue	1,762	2,755
Operating Segments [Member] | Oil and Gas Markets [Member] | Wireless Exploration Product Revenue [Member]
Total revenue	31,869	5,759
Operating Segments [Member] | Oil and Gas Markets [Member] | Reservoir Product Revenue [Member]
Total revenue	73	155
Operating Segments [Member] | Oil and Gas Markets [Member] | Product [Member]
Total revenue	33,704	8,669
Operating Segments [Member] | Adjacent Markets [Member]
Total revenue	9,815	10,822
Operating Segments [Member] | Adjacent Markets [Member] | Product [Member]
Total revenue	9,776	10,786
Operating Segments [Member] | Adjacent Markets [Member] | Industrial Product [Member]
Total revenue	6,443	7,930
Operating Segments [Member] | Adjacent Markets [Member] | Imaging Products [Member]
Total revenue	3,333	2,856
Operating Segments [Member] | Emerging Markets [Member]
Total revenue	234	93
Operating Segments [Member] | Emerging Markets [Member] | Product [Member]
Total revenue	$ 234	$ 93