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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Total revenue | $ 124,509 | $ 89,253
Product [Member] |  |
Total revenue | 73,333 | 64,109
Operating Segments [Member] | Oil and Gas Markets [Member] |  |
Total revenue | 73,993 | 49,141
Operating Segments [Member] | Oil and Gas Markets [Member] | Traditional Exploration Product Revenue [Member] |  |
Total revenue | 12,081 | 6,558
Operating Segments [Member] | Oil and Gas Markets [Member] | Wireless Exploration Product Revenue [Member] |  |
Total revenue | 10,168 | 15,822
Operating Segments [Member] | Oil and Gas Markets [Member] | Reservoir Product Revenue [Member] |  |
Total revenue | 962 | 1,968
Operating Segments [Member] | Oil and Gas Markets [Member] | Product [Member] |  |
Total revenue | 23,211 | 24,348
Operating Segments [Member] | Adjacent Markets [Member] |  |
Total revenue | 49,039 | 39,171
Operating Segments [Member] | Adjacent Markets [Member] | Product [Member] |  |
Total revenue | 48,888 | 39,000
Operating Segments [Member] | Adjacent Markets [Member] | Industrial Product [Member] |  |
Total revenue | 36,859 | 25,640
Operating Segments [Member] | Adjacent Markets [Member] | Imaging Products [Member] |  |
Total revenue | 12,029 | 13,360
Operating Segments [Member] | Emerging Markets [Member] |  |
Total revenue | 1,234 | 711
Operating Segments [Member] | Emerging Markets [Member] | Product [Member] |  |
Total revenue | 1,234 | 711
Operating Segments [Member] | Corporate Segment [Member] |  |
Total revenue | $ 0 | $ 50

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