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Note 3 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenues $ 9,608 $ 1,991
Cost of sales 7,298 2,887
General and administrative 24,345 18,797
Depreciation 1,214 1,247
Total costs and expenses 32,857 22,931
Operating income (loss) (23,249) (20,940)
Water and Land Resources [Member]    
Revenues 1,708 1,251
Cost of sales 2,984 2,241
General and administrative 22,525 18,042
Depreciation 1,159 1,096
Total costs and expenses 26,668 21,379
Operating income (loss) (24,960) (20,128)
Water Treatment [Member]    
Revenues 7,900 740
Cost of sales 4,314 646
General and administrative 1,820 755
Depreciation 55 151
Total costs and expenses 6,189 1,552
Operating income (loss) $ 1,711 $ (812)