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Note 2 - Reportable Segments - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues $ 3,224 $ 368 $ 4,858 $ 1,307
Cost of sales 2,409 692 4,265 1,482
General and administrative 5,275 5,127 16,310 14,378
Depreciation 307 308 907 942
Total costs and expenses 7,991 6,127 21,482 16,802
Operating income (loss) (4,767) (5,759) (16,624) (15,495)
Water and Land Resources [Member]        
Revenues 383 199 1,369 708
Cost of sales 557 513 1,896 967
General and administrative 4,820 4,927 15,217 13,926
Depreciation 292 277 866 826
Total costs and expenses 5,669 5,717 17,979 15,719
Operating income (loss) (5,286) (5,518) (16,610) (15,011)
Water Treatment [Member]        
Revenues 2,841 169 3,489 599
Cost of sales 1,852 179 2,369 515
General and administrative 455 200 1,093 452
Depreciation 15 31 41 116
Total costs and expenses 2,322 410 3,503 1,083
Operating income (loss) $ 519 $ (241) $ (14) $ (484)