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Note 12 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Aug. 31, 2025 | Aug. 01, 2025
Goodwill | $ 1,258 | $ 736 |  |
Finite-Lived Intangible Assets, Net | 5,155 | 1,649 |  |
Impairment of Intangible Assets, Finite-Lived | 0 | 2,761 |  |
Amortization of Intangible Assets | 218 | 395 |  |
Intelligent Industrial [Member] |  |  |  |
Goodwill | 500 |  |  |
Finite-Lived Intangible Assets, Net | 3,700 |  |  |
Smart Water [Member] |  |  |  |
Goodwill | 700 |  |  |
Finite-Lived Intangible Assets, Net | 400 |  |  |
Energy Solutions [Member] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 1,100 |  |  |
Oil and Gas Markets [Member] |  |  |  |
Impairment of Intangible Assets, Finite-Lived |  | $ 2,800 |  |
Geovox [Member] |  |  |  |
Goodwill |  |  | $ 500 | $ 500
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill |  |  | $ 3,700 | $ 3,700

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