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Note 21 - Segment and Geographic Information (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2025
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
Revenue: |  |  |  |  |  |  |  |
Smart Water |  | $ | 35,816 |  |  | $ | 32,434 |
Energy Solutions |  |  | 50,706 |  |  |  | 77,977 |
Intelligent Industrial |  |  | 23,960 |  |  |  | 24,891 |
Corporate |  |  | 321 |  |  |  | 296 |
|  | 110,803 |  |  | 135,598 |
Cost of revenue: |  |  |  |  |  |  |  |
Smart Water |  |  | 21,106 |  |  |  | 16,653 |
Energy Solutions |  |  | 36,580 |  |  |  | 46,922 |
Intelligent Industrial |  |  | 20,082 |  |  |  | 19,335 |
Corporate |  |  | 138 |  |  |  | 115 |
|  | 77,906 |  |  | 83,025 |
Gross profit: |  |  |  |  |  |  |  |
Smart Water |  |  | 14,710 |  |  |  | 15,781 |
Energy Solutions |  |  | 14,126 |  |  |  | 31,055 |
Intelligent Industrial |  |  | 3,878 |  |  |  | 5,556 |
Corporate |  |  | 183 |  |  |  | 181 |
|  | 32,897 |  |  | 52,573 |
Operating expenses: |  |  |  |  |  |  |  |
Smart Water |  |  | 9,047 |  |  |  | 6,566 |
Energy Solutions |  |  | 13,738 |  |  |  | 12,485 |
Intelligent Industrial |  |  | 8,207 |  |  |  | 12,247 |
Corporate |  |  | 17,805 |  |  |  | 14,158 |
|  | 48,797 |  |  | 45,456 |
Gain on disposal of property: |  |  |  |  |  |  |  |
Corporate |  |  | 4,616 |  |  |  | — |
Income (loss) from operations: |  |  |  |  |  |  |  |
Smart Water |  |  | 5,663 |  |  |  | 9,215 |
Energy Solutions |  |  | 388 |  |  |  | 18,570 |
Intelligent Industrial |  |  | (4,329 | ) |  |  | (6,691 | )
Corporate |  |  | (13,006 | ) |  |  | (13,977 | )
|  | (11,284 | ) |  | 7,117 |
Other segment disclosures: |  |  |  |  |  |  |  |
Interest income: |  |  |  |  |  |  |  |
Smart Water |  |  | — |  |  |  | 315 |
Energy Solutions |  |  | 1,694 |  |  |  | — |
Intelligent Industrial |  |  | — |  |  |  | — |
Corporate |  |  | 843 |  |  |  | 1,243 |
|  | 2,537 |  |  | 1,558 |
Interest expense: |  |  |  |  |  |  |  |
Smart Water |  |  | — |  |  |  | 17 |
Energy Solutions |  |  | 23 |  |  |  | — |
Corporate |  |  | 146 |  |  |  | 170 |
|  | 169 |  |  | 187 |
Depreciation and amortization expenses: |  |  |  |  |  |  |  |
Smart Water |  |  | 1,145 |  |  |  | 482 |
Energy Solutions |  |  | 7,333 |  |  |  | 13,243 |
Intelligent Industrial |  |  | 1,049 |  |  |  | 653 |
Corporate |  |  | 619 |  |  |  | 388 |
|  | 10,146 |  |  | 14,766 |
Impairment, inventory obsolescence and stock-based compensation expenses: |  |  |  |  |  |  |  |
Smart Water |  |  | 31 |  |  |  | 189 |
Energy Solutions |  |  | 2,618 |  |  |  | 993 |
Intelligent Industrial |  |  | 907 |  |  |  | 2,830 |
Corporate |  |  | 1,020 |  |  |  | 642 |
|  | 4,576 |  |  | 4,654 |
Schedule of Revenue Generated by the Company's Subsidiaries [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
United States |  | $ | 106,603 |  |  | $ | 127,488 |
Canada |  |  | 1,552 |  |  |  | 1,777 |
Russian Federation |  |  | — |  |  |  | 3,487 |
United Kingdom |  |  | 2,648 |  |  |  | 2,846 |
|  | $ | 110,803 |  |  | $ | 135,598 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | YEAR ENDED SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
Asia (including Russian Federation) |  | $ | 26,552 |  |  | $ | 51,103 |
Canada |  |  | 2,931 |  |  |  | 2,015 |
Europe |  |  | 5,067 |  |  |  | 13,817 |
Mexico |  |  | 2,746 |  |  |  | 1,959 |
South America |  |  | 3,146 |  |  |  | 2,798 |
United States |  |  | 69,291 |  |  |  | 63,061 |
Other |  |  | 1,070 |  |  |  | 845 |
|  | $ | 110,803 |  |  | $ | 135,598 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | AS OF SEPTEMBER 30, |
|  | 2025 |  |  | 2024 |
United States |  | $ | 63,332 |  |  | $ | 61,487 |
Canada |  |  | 366 |  |  |  | 414 |
Colombia |  |  | 392 |  |  |  | 399 |
United Kingdom |  |  | 447 |  |  |  | 528 |
|  | $ | 64,537 |  |  | $ | 62,828 |

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