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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Sales	$ 10,281,844	$ 7,421,198
Ceramic Diesel Particulate [Member]
Net Sales	1,560,062	2,243,268
Liquid Filters [Member]
Net Sales	7,980,287	5,040,333
Plastic Products [Member]
Net Sales	581,411
Development Projects [Member]
Net Sales	$ 160,084	$ 137,597

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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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