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Note 2 - Reportable Segments - Assets by Operating Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets $ 145,576 $ 134,494
Water and Land Resources [Member]    
Assets 134,635 123,786
Water Filtration Technology [Member]    
Assets $ 10,941 $ 10,708