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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue, Percentage	100.00%	100.00%
Revenue	$ 18,273,442	$ 22,526,201
Liquid Filters [Member]
Revenue, Percentage	39.00%	63.00%
Revenue	$ 7,196,465	$ 14,147,842
Diesel Particulate Filters [Member]
Revenue, Percentage	39.00%	22.00%
Revenue	$ 7,183,868	$ 5,131,891
Plastics Components [Member]
Revenue, Percentage	20.00%	12.00%
Revenue	$ 3,615,681	$ 2,647,366
Development Projects [Member]
Revenue, Percentage	2.00%	3.00%
Revenue	$ 277,428	$ 599,102

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