Note 3 - Disaggregation of Revenues and Segment Reporting - Summary of Segment Activity (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenue	$ 4,485,062		$ 4,990,019		$ 8,720,406	$ 9,001,538
Net loss	(2,111,700)	$ (2,388,295)	(1,555,292)	$ (2,389,503)	(4,499,995)	(3,944,795)
Segment assets	28,579,302				28,579,302		$ 35,971,847
Water Segment [Member]
Net loss	(254,251)		2,439		(688,739)	(461,036)
Segment assets	8,702,209				8,702,209		9,432,991
Water Segment [Member] | Operating Segments [Member]
Revenue	1,870,625		2,070,298		3,419,291	3,505,217
Ceramics Segment [Member]
Net loss	(340,160)		(439,090)		(1,318,834)	(1,000,774)
Segment assets	13,060,929				13,060,929		14,550,872
Ceramics Segment [Member] | Operating Segments [Member]
Revenue	1,665,138		1,789,465		3,471,474	3,198,837
Plastics Segment [Member] | Operating Segments [Member]
Revenue	949,299		1,127,455		1,829,641	2,294,683
Plastic Products [Member]
Net loss	(240,414)		(67,272)		(240,413)	(133,333)
Segment assets	723,729				723,729		759,745
Corporate Segment [Member] | Operating Segments [Member]
Revenue	0		2,801		0	2,801
Other Operating Segment [Member]
Net loss	(1,276,875)		$ (1,051,369)		(1,978,241)	$ (2,349,652)
Segment assets	$ 6,092,435				$ 6,092,435		$ 11,228,239