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Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total Revenue $ 22,526,201 $ 32,637,484
Total consolidated Income (Loss) (9,808,360) 39,616
Segment assets 42,210,137 38,589,723
Water Segment [Member]    
Total Revenue 13,615,904 24,570,867
Total consolidated Income (Loss) (1,083,578) 1,713,150
Segment assets 14,033,107 14,718,598
Ceramics Segment [Member]    
Total Revenue 5,663,830 6,546,432
Total consolidated Income (Loss) (3,532,137) (600,939)
Segment assets 16,734,371 21,499,120
Plastic Products [Member]    
Total Revenue 2,647,366 895,203
Total consolidated Income (Loss) (882,038) 49,440
Segment assets 2,022,381 2,177,791
Other Segments [Member]    
Total Revenue 599,101 624,982
Total consolidated Income (Loss) (4,310,607) (1,122,035)
Segment assets $ 9,420,278 $ 193,543