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v3.20.1

Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Net Sales | $ 32,637,484 | $ 12,232,088
Ceramic Diesel Particulate [Member] |  |
Net Sales | 5,652,686 | 6,536,085
Liquid Filters [Member] |  |
Net Sales | 25,464,614 | 5,264,663
Plastic Products [Member] |  |
Net Sales | 895,203 |
Development Projects [Member] |  |
Net Sales | $ 625,981 | $ 431,340

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