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Note 12 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenue $ 5,018,292   $ 4,016,563   $ 8,655,528 $ 8,014,440  
Net Loss (6,507,059) $ (3,746,424) (3,098,108) $ (2,459,429) (10,253,483) (5,557,537)  
Segment assets 45,520,916       45,520,916   $ 45,054,692
Corporate, Non-Segment [Member]              
Revenue 26,242   109,466   51,772 204,897  
Water Segment [Member]              
Net Loss 37,252   (944,122)   (756,696) (1,580,562)  
Segment assets 7,496,259       7,496,259   7,767,679
Water Segment [Member] | Operating Segments [Member]              
Revenue 2,144,011   1,080,004   2,737,002 2,237,340  
Ceramics Segment [Member]              
Net Loss (1,689,972)   (1,457,862)   (2,746,320) (1,882,398)  
Segment assets 15,280,659       15,280,659   13,961,057
Ceramics Segment [Member] | Operating Segments [Member]              
Revenue 1,812,334   1,810,743   3,692,452 3,741,807  
Plastics Segment [Member] | Operating Segments [Member]              
Revenue 1,035,705   1,016,370   2,174,302 1,830,396  
Plastic Products [Member]              
Net Loss (132,198)   (275,324)   (239,600) (528,303)  
Segment assets 1,392,470       1,392,470   1,645,879
Other Segments [Member]              
Net Loss (4,722,141)   $ (420,800)   (6,510,867) $ (1,566,274)  
Segment assets $ 21,351,528       $ 21,351,528   $ 21,680,077