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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues $ 4,126 $ 513 $ 7,080 $ 1,634
Cost of sales 2,665 852 4,743 1,856
General and administrative 6,935 6,305 15,042 11,035
Depreciation 303 305 605 600
Total costs and expenses 9,903 7,462 20,390 13,491
Operating (loss) income (5,777) (6,949) (13,310) (11,857)
Water and Land Resources [Member]        
Operating (loss) income       (11,324)
Water Treatment [Member]        
Operating (loss) income       (533)
Water and Land Resources [Member]        
Revenues 431 350 996  
Cost of sales 614 679 1,113  
General and administrative 5,750 5,917 13,147  
Depreciation 294 292 589  
Total costs and expenses 6,658 6,888 14,849  
Operating (loss) income (6,227) (6,538) (13,853)  
Water and Land Resources [Member] | Water and Land Resources [Member]        
Revenues       986
Cost of sales       1,339
General and administrative       10,397
Depreciation       574
Total costs and expenses       12,310
Water Treatment [Member]        
Revenues 3,695 163 6,084  
Cost of sales 2,051 173 3,630  
General and administrative 1,185 388 1,895  
Depreciation 9 13 16  
Total costs and expenses 3,245 574 5,541  
Operating (loss) income $ 450 $ (411) $ 543  
Water Treatment [Member] | Water Treatment [Member]        
Revenues       648
Cost of sales       517
General and administrative       638
Depreciation       26
Total costs and expenses       $ 1,181