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Note 2 - Reportable Segments - Goodwill by Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Goodwill $ 5,714 $ 5,714
Water and Land Resources [Member]    
Goodwill 3,813 3,813
Water Filtration Technology [Member]    
Goodwill $ 1,901 $ 1,901