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Note 2 - Reportable Segments - Assets by Operating Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets $ 125,507 $ 107,374
Water and Land Resources [Member]    
Assets 119,013 101,946
Water Filtration Technology [Member]    
Assets $ 6,494 $ 5,428