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Note 12 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Revenue $ 3,305,534     $ 4,142,954     $ 11,961,062 $ 12,157,394  
Net Loss (1,752,664) $ (6,507,059) $ (3,746,424) (2,903,956) $ (3,098,108) $ (2,459,429) (12,006,147) (8,461,493)  
Segment assets 40,651,333           40,651,333   $ 45,054,692
Corporate, Non-Segment [Member]                  
Revenue 0     90,452     50,253 295,350  
Water Segment [Member]                  
Revenue 785,046     1,493,549     3,522,049 3,730,889  
Net Loss (107,681)     (531,868)     (864,378) (2,112,430)  
Segment assets 6,874,447           6,874,447   7,767,679
Water Segment [Member] | Operating Segments [Member]                  
Revenue 785,046     1,493,549     3,522,049 3,730,889  
Ceramics Segment [Member]                  
Revenue 1,854,981     1,703,057     5,548,951 5,444,863  
Net Loss (772,862)     (798,615)     (3,519,182) (2,681,013)  
Segment assets 13,889,897           13,889,897   13,961,057
Ceramics Segment [Member] | Operating Segments [Member]                  
Revenue 1,854,981     1,703,057     5,548,951 5,444,863  
Plastics Segment [Member]                  
Revenue 665,507     855,896     2,839,809 2,686,292  
Plastics Segment [Member] | Operating Segments [Member]                  
Revenue 665,507     855,896     2,839,809 2,686,292  
Plastic Products [Member]                  
Net Loss (152,492)     (358,880)     (392,092) (887,184)  
Segment assets 1,207,357           1,207,357   1,645,879
Other Segments [Member]                  
Net Loss (719,629)     $ (1,214,593)     (7,230,495) $ (2,780,866)  
Segment assets $ 18,679,632           $ 18,679,632   $ 21,680,077