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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net Sales	$ 22,526,201	$ 32,637,484
Liquid Filters [Member]
Net Sales	14,147,842	25,464,614
Ceramic Diesel Particulate [Member]
Net Sales	5,131,891	5,652,686
Plastic Products [Member]
Net Sales	2,647,366	895,203
Development Projects [Member]
Net Sales	$ 599,102	$ 625,981

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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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