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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues $ 130 $ 142
General and administrative 3,953 3,806
Depreciation 329 121
Total costs and expenses 4,282 3,927
Operating loss (4,152) $ (3,785)
Water and Land Resources [Member]    
Revenues 130  
General and administrative 3,789  
Depreciation 278  
Total costs and expenses 4,067  
Operating loss (3,937)  
Water Treatment [Member]    
Revenues 0  
General and administrative 164  
Depreciation 51  
Total costs and expenses 215  
Operating loss $ (215)