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Note 3 - Disaggregation of Revenues and Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenue $ 2,478,221     $ 5,070,446     $ 11,198,627 $ 14,071,984  
Net loss (2,840,526) $ (2,111,700) $ (2,388,295) (1,414,230) $ (1,555,292) $ (2,389,503) (7,340,521) (5,359,025)  
Total assets 28,725,344           28,725,344   $ 35,971,847
Water Segment [Member]                  
Net loss (627,456)     177,446     (1,316,195) (283,590)  
Total assets 8,529,038           8,529,038   9,432,991
Water Segment [Member] | Operating Segments [Member]                  
Revenue 687,684     2,629,910     4,106,975 6,135,127  
Ceramics Segment [Member]                  
Net loss (735,131)     (531,682)     (2,053,965) (1,532,455)  
Total assets 12,985,577           12,985,577   14,550,872
Ceramics Segment [Member] | Operating Segments [Member]                  
Revenue 1,077,630     1,608,763     4,549,104 4,807,600  
Plastics Segment [Member] | Operating Segments [Member]                  
Revenue 663,198     656,693     2,492,839 2,951,376  
Plastic Products [Member]                  
Net loss (510,423)     (365,978)     (1,024,604) (499,312)  
Total assets 1,907,108           1,907,108   759,745
Corporate Segment [Member] | Operating Segments [Member]                  
Revenue 49,709     175,080     49,709 177,881  
Other Operating Segment [Member]                  
Net loss (967,516)     $ (694,016)     (2,945,757) $ (3,043,668)  
Total assets $ 5,303,621           $ 5,303,621   $ 11,228,239