Note 10 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue	$ 4,016,563		$ 4,641,483		$ 8,014,440	$ 14,923,327
Net Income (Loss)	(3,098,108)	$ (2,459,429)	(2,563,811)	$ 303,499	(5,557,537)	(2,260,312)
Segment assets	51,404,432		51,404,432		51,404,432	51,404,432	$ 42,210,137
Consolidation, Eliminations [Member]
Revenue	(302,771)		(279,861)		(295,463)	(1,164,579)
Water Segment [Member]
Net Income (Loss)	(944,122)		(506,209)		(1,580,562)	110,758
Segment assets	12,166,764				12,166,764		14,033,107
Water Segment [Member] | Operating Segments [Member]
Revenue	1,152,422		2,395,458		2,309,758	10,307,261
Ceramics Segment [Member]
Net Income (Loss)	(1,457,862)		(874,606)		(1,882,398)	(975,701)
Segment assets	15,747,698				15,747,698		16,734,371
Ceramics Segment [Member] | Operating Segments [Member]
Revenue	2,102,693		1,614,135		4,033,757	4,063,731
Plastics Segment [Member] | Operating Segments [Member]
Revenue	1,064,219		911,751		1,966,388	1,716,914
Plastic Products [Member]
Net Income (Loss)	(275,324)		(35,809)		(528,303)	(67,656)
Segment assets	2,352,040				2,352,040		2,022,381
Other Segments [Member]
Net Income (Loss)	(420,800)		$ (1,147,187)		(1,566,274)	$ (1,327,713)
Segment assets	$ 21,137,930				$ 21,137,930		$ 9,420,278