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Note 12 - Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenue | $ 37,223 | $ 50,032
Income (loss) from operations | 7,835 | 12,837
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 76 | 74
Income (loss) from operations | (4,877) | (3,135)
Smart Water [Member] | Operating Segments [Member] |  |
Revenue | 7,288 | 4,234
Income (loss) from operations | 370 | 1,095
Energy Solutions [Member] | Operating Segments [Member] |  |
Revenue | 24,282 | 39,911
Income (loss) from operations | 13,282 | 15,068
Intelligent Industrial [Member] | Operating Segments [Member] |  |
Revenue | 5,577 | 5,813
Income (loss) from operations | $ (940) | $ (191)

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