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Note 2 - Reportable Segments - Goodwill by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Goodwill	$ 5,714	$ 5,714
Water and Land Resources [Member]
Goodwill	3,813	3,813
Water Filtration Technology [Member]
Goodwill	$ 1,901	$ 1,901

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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