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Note 2 - Reportable Segments - Assets by Operating Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets $ 128,006 $ 134,494
Water and Land Resources [Member]    
Assets 118,208 123,786
Water Filtration Technology [Member]    
Assets $ 9,798 $ 10,708