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Note 2 - Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2023 |  |  | 2022 |
Oil and Gas Markets |  |  |  |  |  |  |  |
Traditional exploration product revenue |  | $ | 12,081 |  |  | $ | 6,558 |
Wireless exploration product revenue |  |  | 10,168 |  |  |  | 15,822 |
Reservoir product revenue |  |  | 962 |  |  |  | 1,968 |
Total revenue |  |  | 23,211 |  |  |  | 24,348 |
Adjacent Markets |  |  |  |  |  |  |  |
Industrial product revenue |  |  | 36,859 |  |  |  | 25,640 |
Imaging product revenue |  |  | 12,029 |  |  |  | 13,360 |
Total revenue |  |  | 48,888 |  |  |  | 39,000 |
Emerging Markets |  |  |  |  |  |  |  |
Revenue |  |  | 1,234 |  |  |  | 711 |
Corporate |  |  |  |  |  |  |  |
Revenue |  |  | — |  |  |  | 50 |
Total |  | $ | 73,333 |  |  | $ | 64,109 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2023 |  |  | 2022 |
Asia (including Russian Federation) |  | $ | 13,006 |  |  | $ | 10,978 |
Canada |  |  | 1,032 |  |  |  | 890 |
Europe |  |  | 5,976 |  |  |  | 15,705 |
South America |  |  | 448 |  |  |  | 719 |
United States |  |  | 49,828 |  |  |  | 33,778 |
Other |  |  | 3,043 |  |  |  | 2,039 |
|  | $ | 73,333 |  |  | $ | 64,109 |

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