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Note 2 - Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2023 |  |  | June 30, 2022 |  |  | June 30, 2023 |  |  | June 30, 2022 |
Oil and Gas Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Traditional exploration product revenue |  | $ | 3,363 |  |  | $ | 1,592 |  |  | $ | 9,414 |  |  | $ | 3,389 |
Wireless exploration product revenue |  |  | 907 |  |  |  | 100 |  |  |  | 8,077 |  |  |  | 14,358 |
Reservoir product revenue |  |  | 523 |  |  |  | 692 |  |  |  | 810 |  |  |  | 1,513 |
Total revenue |  |  | 4,793 |  |  |  | 2,384 |  |  |  | 18,301 |  |  |  | 19,260 |
Adjacent Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial product revenue |  |  | 11,678 |  |  |  | 7,465 |  |  |  | 29,250 |  |  |  | 18,471 |
Imaging product revenue |  |  | 3,147 |  |  |  | 3,429 |  |  |  | 9,032 |  |  |  | 9,708 |
Total revenue |  |  | 14,825 |  |  |  | 10,894 |  |  |  | 38,282 |  |  |  | 28,179 |
Emerging Markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 109 |  |  |  | 135 |  |  |  | 393 |  |  |  | 571 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | — |  |  |  | 50 |  |  |  | — |  |  |  | 50 |
Total |  | $ | 19,727 |  |  | $ | 13,463 |  |  | $ | 56,976 |  |  | $ | 48,060 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2023 |  |  | June 30, 2022 |  |  | June 30, 2023 |  |  | June 30, 2022 |
Asia (including Russian Federation) |  | $ | 3,287 |  |  | $ | 1,223 |  |  | $ | 11,264 |  |  | $ | 7,580 |
Canada |  |  | 85 |  |  |  | 577 |  |  |  | 1,179 |  |  |  | 1,634 |
Europe |  |  | 1,856 |  |  |  | 1,625 |  |  |  | 4,782 |  |  |  | 14,368 |
United States |  |  | 13,481 |  |  |  | 9,297 |  |  |  | 37,551 |  |  |  | 22,621 |
Other |  |  | 1,018 |  |  |  | 741 |  |  |  | 2,200 |  |  |  | 1,857 |
Total |  | $ | 19,727 |  |  | $ | 13,463 |  |  | $ | 56,976 |  |  | $ | 48,060 |

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