v3.26.1
Note 2 - Reportable Segments - Goodwill by Operating Segment (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Goodwill $ 5,714 $ 5,714
Water and Land Resources [Member]    
Goodwill 3,813 3,813
Water Treatment [Member]    
Goodwill $ 1,901 $ 1,901