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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 5,018,292	$ 4,016,563	$ 8,655,528	$ 8,014,440
Liquid Filters [Member]
Revenue	2,144,011	1,080,004	2,737,002	2,237,340
Diesel Particulate Filters [Member]
Revenue	1,812,334	1,810,743	3,692,452	3,741,807
Plastics Components [Member]
Revenue	1,035,705	1,016,370	2,174,302	1,830,396
Development Projects [Member]
Revenue	$ 26,242	$ 109,446	$ 51,772	$ 204,897

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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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