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Note 4 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total revenues $ 1,991 $ 1,501
Cost of sales 2,887 2,067
General and administrative 18,797 15,342
Depreciation 1,247 654
Total costs and expenses 22,931 18,063
Operating loss (20,940) $ (16,562)
Water and Land Resources [Member]    
Total revenues 1,251  
Cost of sales 2,241  
General and administrative 18,042  
Depreciation 1,096  
Total costs and expenses 21,379  
Operating loss (20,128)  
Water Treatment [Member]    
Total revenues 740  
Cost of sales 646  
General and administrative 755  
Depreciation 151  
Total costs and expenses 1,552  
Operating loss $ (812)