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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, Percentage	100.00%	100.00%
Revenue	$ 3,637,236	$ 3,997,877
Liquid Filters [Member]
Revenue, Percentage	16.00%	30.00%
Revenue	$ 592,990	$ 1,157,336
Diesel Particulate Filters [Member]
Revenue, Percentage	52.00%	48.00%
Revenue	$ 1,880,118	$ 1,931,064
Plastics Components [Member]
Revenue, Percentage	31.00%	20.00%
Revenue	$ 1,138,597	$ 814,025
Development Projects [Member]
Revenue, Percentage	1.00%	2.00%
Revenue	$ 25,530	$ 95,452

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