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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues $ 4,149 $ 3,224 $ 11,229 $ 4,858
Cost of sales 3,015 2,409 7,758 4,265
General and administrative 5,726 5,275 20,768 16,310
Depreciation 304 307 909 907
Total costs and expenses 9,045 7,991 29,435 21,482
Operating (loss) income (4,896) (4,767) (18,206) (16,624)
Water and Land Resources [Member]        
Operating (loss) income       (16,610)
Water Treatment [Member]        
Operating (loss) income       (14)
Water and Land Resources [Member]        
Revenues 115 383 1,111  
Cost of sales 985 557 2,098  
General and administrative 4,730 4,820 17,877  
Depreciation 295 292 884  
Total costs and expenses 6,010 5,669 20,859  
Operating (loss) income (5,895) (5,286) (19,748)  
Water and Land Resources [Member] | Water and Land Resources [Member]        
Revenues       1,369
Cost of sales       1,896
General and administrative       15,217
Depreciation       866
Total costs and expenses       17,979
Water Treatment [Member]        
Revenues 4,034 2,841 10,118  
Cost of sales 2,030 1,852 5,660  
General and administrative 996 455 2,891  
Depreciation 9 15 25  
Total costs and expenses 3,035 2,322 8,576  
Operating (loss) income $ 999 $ 519 $ 1,542  
Water Treatment [Member] | Water Treatment [Member]        
Revenues       3,489
Cost of sales       2,369
General and administrative       1,093
Depreciation       41
Total costs and expenses       $ 3,503