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Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Revenue $ 4,235,344 $ 4,011,519  
Revenue 4,235,344 4,011,519  
Net Loss (2,388,295) (2,389,503)  
Segment assets 31,366,068   $ 35,971,847
Water Segment [Member]      
Revenue 1,548,666 1,434,919  
Revenue 1,548,666 1,434,919  
Net Loss (434,488) (463,475)  
Segment assets 9,265,195   9,432,991
Water Segment [Member] | Operating Segments [Member]      
Revenue 1,548,666 1,434,919  
Revenue 1,548,666 1,434,919  
Ceramics Segment [Member]      
Revenue 1,806,336 1,409,372  
Revenue 1,806,336 1,409,372  
Net Loss (978,673) (561,684)  
Segment assets 13,080,143   14,550,872
Ceramics Segment [Member] | Operating Segments [Member]      
Revenue 1,806,336 1,409,372  
Revenue 1,806,336 1,409,372  
Plastic Products [Member]      
Net Loss (273,768) (66,061)  
Segment assets 875,450   759,745
Plastics Segment [Member]      
Revenue 880,342 1,167,228  
Revenue 880,342 1,167,228  
Plastics Segment [Member] | Operating Segments [Member]      
Revenue 880,342 1,167,228  
Revenue 880,342 1,167,228  
Other Operating Segment [Member]      
Net Loss (701,366) (1,298,283)  
Segment assets 8,145,280   $ 11,228,239
Corporate Segment [Member]      
Revenue 0 0  
Revenue 0 0  
Corporate Segment [Member] | Operating Segments [Member]      
Revenue 0 0  
Revenue $ 0 $ 0