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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues $ 2,954 $ 1,121
Cost of sales 2,078 1,004
General and administrative 8,107 4,730
Depreciation 302 295
Total costs and expenses 10,487 6,029
Operating (loss) income (7,533) (4,908)
Water and Land Resources [Member]    
Revenues 565 636
Cost of sales 499 660
General and administrative 7,397 4,480
Depreciation 295 282
Total costs and expenses 8,191 5,422
Operating (loss) income (7,626) (4,786)
Water Treatment [Member]    
Revenues 2,389 485
Cost of sales 1,579 344
General and administrative 710 250
Depreciation 7 13
Total costs and expenses 2,296 607
Operating (loss) income $ 93 $ (122)