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Note 4 - Reportable Segments - Assets by Operating Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets $ 107,374 $ 110,787
Water and Land Resources [Member]    
Assets 101,946 107,439
Water Filtration Technology [Member]    
Assets $ 5,428 $ 3,348