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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue	$ 3,305,534	$ 4,142,954	$ 11,961,062	$ 12,157,394
Water Segment [Member]
Revenue	785,046	1,493,549	3,522,049	3,730,889
Ceramics Segment [Member]
Revenue	1,854,981	1,703,057	5,548,951	5,444,863
Plastics Segment [Member]
Revenue	665,507	855,896	2,839,809	2,686,292
Corporate Segment [Member]
Revenue	$ 0	$ 90,452	$ 50,253	$ 295,350

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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