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Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 4,016,563	$ 4,641,483	$ 8,014,440	$ 14,923,327
Liquid Filters [Member]
Revenue	1,080,004	2,551,710	2,237,340	10,531,998
Diesel Particulate Filters [Member]
Revenue	1,810,743	1,160,695	3,741,807	2,720,757
Plastic Products [Member]
Revenue	1,016,370	762,384	1,830,396	1,343,794
Development Projects [Member]
Revenue	$ 109,446	$ 166,694	$ 204,897	$ 326,778

X

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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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