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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Sales	$ 4,641,483	$ 9,297,186	$ 14,923,327	$ 16,718,384
Liquid Filters [Member]
Net Sales	2,551,710	8,453,136	10,531,998	13,493,469
Ceramic Diesel Particulate [Member]
Net Sales	1,160,695	747,234	2,720,757	2,990,502
Plastic Products [Member]
Net Sales	762,384	0	1,343,794	0
Development Projects [Member]
Net Sales	$ 166,694	$ 96,815	$ 326,778	$ 234,413

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- Definition

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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