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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue, Percentage	100.00%	100.00%
Revenue	$ 15,982,438	$ 18,273,442
Water Segment [Member]
Revenue, Percentage	33.00%	39.00%
Revenue	$ 5,297,286	$ 7,196,465
Ceramics Segment [Member]
Revenue, Percentage	43.00%	39.00%
Revenue	$ 6,844,861	$ 7,183,868
Plastics Segment [Member]
Revenue, Percentage	22.00%	20.00%
Revenue	$ 3,528,606	$ 3,615,681
Corporate Segment [Member]
Revenue, Percentage	2.00%	2.00%
Revenue	$ 311,685	$ 277,428

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