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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue, Percentage	100.00%	100.00%
Revenue	$ 4,011,519	$ 3,637,236
Water Segment [Member]
Revenue, Percentage	36.00%	16.00%
Revenue	$ 1,434,919	$ 592,990
Ceramics Segment [Member]
Revenue, Percentage	35.00%	52.00%
Revenue	$ 1,409,372	$ 1,880,118
Plastics Segment [Member]
Revenue, Percentage	29.00%	31.00%
Revenue	$ 1,167,228	$ 1,138,597
Corporate Segment [Member]
Revenue, Percentage	0.00%	1.00%
Revenue	$ 0	$ 25,530

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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