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Note 2 - Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
Smart Water |  | $ | 35,816 |  |  | $ | 32,434 |
Energy Solutions |  |  | 44,600 |  |  |  | 58,878 |
Intelligent Industrial |  |  | 23,788 |  |  |  | 24,724 |
Total |  | $ | 104,204 |  |  | $ | 116,036 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
Asia (including Russian Federation) |  | $ | 24,986 |  |  | $ | 43,831 |
Canada |  |  | 2,529 |  |  |  | 1,578 |
Europe |  |  | 4,864 |  |  |  | 6,430 |
Mexico |  |  | 2,746 |  |  |  | 1,959 |
South America |  |  | 843 |  |  |  | 384 |
United States |  |  | 67,311 |  |  |  | 61,009 |
Other |  |  | 925 |  |  |  | 845 |
|  | $ | 104,204 |  |  | $ | 116,036 |

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