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Note 2 - Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2024 |  |  | June 30, 2023 |  |  | June 30, 2024 |  |  | June 30, 2023 |
Oil and Gas Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Traditional exploration product revenue |  | $ | 2,005 |  |  | $ | 3,363 |  |  | $ | 7,239 |  |  | $ | 9,414 |
Wireless exploration product revenue |  |  | 1,460 |  |  |  | 907 |  |  |  | 36,008 |  |  |  | 8,077 |
Reservoir product revenue |  |  | 189 |  |  |  | 523 |  |  |  | 303 |  |  |  | 810 |
Total revenue |  |  | 3,654 |  |  |  | 4,793 |  |  |  | 43,550 |  |  |  | 18,301 |
Adjacent Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial product revenue |  |  | 13,026 |  |  |  | 11,678 |  |  |  | 28,492 |  |  |  | 29,250 |
Imaging product revenue |  |  | 2,903 |  |  |  | 3,147 |  |  |  | 9,405 |  |  |  | 9,032 |
Total revenue |  |  | 15,929 |  |  |  | 14,825 |  |  |  | 37,897 |  |  |  | 38,282 |
Emerging Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 640 |  |  |  | 109 |  |  |  | 1,987 |  |  |  | 393 |
Total |  | $ | 20,223 |  |  | $ | 19,727 |  |  | $ | 83,434 |  |  | $ | 56,976 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2024 |  |  | June 30, 2023 |  |  | June 30, 2024 |  |  | June 30, 2023 |
Asia (including Russian Federation) |  | $ | 3,430 |  |  | $ | 3,287 |  |  | $ | 39,318 |  |  | $ | 11,264 |
Canada |  |  | 178 |  |  |  | 85 |  |  |  | 2,406 |  |  |  | 1,179 |
Europe |  |  | 1,137 |  |  |  | 1,856 |  |  |  | 4,022 |  |  |  | 4,782 |
United States |  |  | 14,436 |  |  |  | 13,481 |  |  |  | 35,685 |  |  |  | 37,551 |
Other |  |  | 1,042 |  |  |  | 1,018 |  |  |  | 2,003 |  |  |  | 2,200 |
Total |  | $ | 20,223 |  |  | $ | 19,727 |  |  | $ | 83,434 |  |  | $ | 56,976 |

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