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Note 2 - Revenue Recognition (Tables) | 6 Months Ended
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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 |

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