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Note 2 - Reportable Segments - Assets by Operating Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets $ 112,553 $ 107,374
Operating Segments [Member]    
Assets 112,553 107,374
Water and Land Resources [Member] | Operating Segments [Member]    
Assets 102,536 101,946
Water Filtration Technology [Member] | Operating Segments [Member]    
Assets $ 10,017 $ 5,428