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Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenue $ 4,990,019   $ 5,018,292   $ 9,001,538 $ 8,655,528  
Net Loss (1,555,292) $ (2,389,503) (6,507,059) $ (3,746,424) (3,944,795) (10,253,483)  
Segment assets 37,321,712       37,321,712   $ 40,125,655
Corporate, Non-Segment [Member]              
Revenue 2,801   26,242   2,801 51,772  
Water Segment [Member]              
Revenue         3,505,217 2,737,002  
Net Loss 2,439   37,252   (461,036) (756,696)  
Segment assets 8,795,824       8,795,824   7,781,211
Water Segment [Member] | Operating Segments [Member]              
Revenue 2,070,298   2,144,011   3,505,217 2,737,002  
Ceramics Segment [Member]              
Revenue         3,198,837 3,692,452  
Net Loss (439,090)   (1,689,972)   (1,000,774) (2,746,320)  
Segment assets 14,484,687       14,484,687   13,808,529
Ceramics Segment [Member] | Operating Segments [Member]              
Revenue 1,789,465   1,812,334   3,198,837 3,692,452  
Plastics Segment [Member]              
Revenue         2,294,683 2,174,302  
Plastics Segment [Member] | Operating Segments [Member]              
Revenue 1,127,455   1,035,705   2,294,683 2,174,302  
Plastic Products [Member]              
Net Loss (67,272)   (132,198)   (133,333) (239,600)  
Segment assets 1,216,916       1,216,916   1,099,019
Corporate Segment [Member]              
Revenue         2,801 51,772  
Net Loss (1,051,369)   $ (4,722,141)   (2,349,652) $ (6,510,867)  
Segment assets $ 12,824,285       $ 12,824,285   $ 17,436,896