Note 9 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue	$ 3,997,877	$ 10,281,844
Net Income (Loss)	(2,459,429)	303,499
Segment assets	36,757,256		$ 42,210,137
Water Segment [Member]
Revenue	1,157,336	7,911,803
Net Income (Loss)	(636,439)	616,967
Segment assets	12,470,391		14,033,107
Ceramics Segment [Member]
Revenue	1,931,065	1,628,546
Net Income (Loss)	(424,535)	(101,095)
Segment assets	15,943,251		16,734,371
Plastic Products [Member]
Revenue	814,025	581,411
Net Income (Loss)	(252,979)	(31,847)
Segment assets	1,622,276		2,022,381
Other Segments [Member]
Revenue	95,451	160,084
Net Income (Loss)	(1,145,476)	$ (180,526)
Segment assets	$ 6,721,338		$ 9,420,278