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Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue $ 3,637,236 $ 3,997,877  
Net Loss (3,746,424) (2,459,429)  
Segment assets 40,431,224   $ 45,054,692
Corporate, Non-Segment [Member]      
Revenue 25,531 95,451  
Water Segment [Member]      
Net Loss (793,949) (636,439)  
Segment assets 7,400,400   7,767,679
Water Segment [Member] | Operating Segments [Member]      
Revenue 592,990 1,157,336  
Ceramics Segment [Member]      
Net Loss (1,056,348) (424,535)  
Segment assets 14,029,312   13,961,057
Ceramics Segment [Member] | Operating Segments [Member]      
Revenue 1,880,118 1,931,065  
Plastic Products [Member]      
Net Loss (107,402) (252,979)  
Segment assets 1,737,388   1,645,879
Plastics Segment [Member] | Operating Segments [Member]      
Revenue 1,138,597 814,025  
Other Segments [Member]      
Net Loss (1,788,725) $ (1,145,476)  
Segment assets $ 17,264,124   $ 21,680,077