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Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenue $ 5,070,446     $ 3,305,534     $ 14,071,984 $ 11,961,062  
Net Loss (1,414,230) $ (1,555,292) $ (2,389,503) (1,752,664) $ (6,507,059) $ (3,746,424) (5,359,025) (12,006,147)  
Segment assets 36,839,028           36,839,028   $ 40,125,655
Corporate, Non-Segment [Member]                  
Revenue 175,080     0     177,881 50,253  
Water Segment [Member]                  
Revenue 2,629,910     785,046     6,135,127 3,522,049  
Net Loss 177,446     (107,681)     (283,590) (864,378)  
Segment assets 9,114,839           9,114,839   7,781,211
Water Segment [Member] | Operating Segments [Member]                  
Revenue 2,629,910     785,046     6,135,127 3,522,049  
Ceramics Segment [Member]                  
Revenue 1,608,763     1,854,981     4,807,600 5,548,951  
Net Loss (531,682)     (772,862)     (1,532,455) (3,519,182)  
Segment assets 14,900,727           14,900,727   13,808,529
Ceramics Segment [Member] | Operating Segments [Member]                  
Revenue 1,608,763     1,854,981     4,807,600 5,548,951  
Plastics Segment [Member]                  
Revenue 656,693     665,507     2,951,376 2,839,809  
Plastics Segment [Member] | Operating Segments [Member]                  
Revenue 656,693     665,507     2,951,376 2,839,809  
Plastic Products [Member]                  
Net Loss (365,978)     (152,492)     (499,312) (392,092)  
Segment assets 894,434           894,434   1,099,019
Corporate Segment [Member]                  
Revenue 175,080     0     177,881 50,253  
Net Loss (694,016)     $ (719,629)     (3,043,668) $ (7,230,495)  
Segment assets $ 11,929,028           $ 11,929,028   $ 17,436,896