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Note 2 - Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2025 |  |  | June 30, 2024 |  |  | June 30, 2025 |  |  | June 30, 2024 |
Smart Water |  | $ | 10,518 |  |  | $ | 9,913 |  |  | $ | 27,278 |  |  | $ | 20,558 |
Energy Solutions |  |  | 6,612 |  |  |  | 3,862 |  |  |  | 29,837 |  |  |  | 43,948 |
Intelligent Industrial |  |  | 6,097 |  |  |  | 6,448 |  |  |  | 17,465 |  |  |  | 18,928 |
Total |  | $ | 23,227 |  |  | $ | 20,223 |  |  | $ | 74,580 |  |  | $ | 83,434 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, 2025 |  |  | June 30, 2024 |  |  | June 30, 2025 |  |  | June 30, 2024 |
Asia (including Russian Federation) |  | $ | 1,684 |  |  | $ | 3,430 |  |  | $ | 21,552 |  |  | $ | 39,318 |
Canada |  |  | 1,022 |  |  |  | 178 |  |  |  | 2,017 |  |  |  | 2,406 |
Europe |  |  | 1,723 |  |  |  | 1,137 |  |  |  | 4,311 |  |  |  | 4,022 |
Mexico |  |  | 240 |  |  |  | 601 |  |  |  | 2,332 |  |  |  | 971 |
United States |  |  | 18,343 |  |  |  | 14,436 |  |  |  | 43,768 |  |  |  | 35,685 |
Other |  |  | 215 |  |  |  | 441 |  |  |  | 600 |  |  |  | 1,032 |
Total |  | $ | 23,227 |  |  | $ | 20,223 |  |  | $ | 74,580 |  |  | $ | 83,434 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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