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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues $ 1,121 $ 130
Cost of sales 1,004 22
General and administrative 4,730 3,931
Depreciation 295 329
Total costs and expenses 6,029 4,282
Operating loss (4,908) (4,152)
Water and Land Resources [Member]    
Revenues 636 130
Cost of sales 660 22
General and administrative 4,480 3,767
Depreciation 282 278
Total costs and expenses 5,422 4,067
Operating loss (4,786) (3,937)
Water Treatment [Member]    
Revenues 485 0
Cost of sales 344 0
General and administrative 250 164
Depreciation 13 51
Total costs and expenses 607 215
Operating loss $ (122) $ (215)