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Note 8 - Significant Customers / Concentration / Disaggregated Revenue - Sales by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Sales	$ 9,297,186	$ 3,598,028	$ 16,718,384	$ 5,989,410
Ceramic Diesel Particulate [Member]
Net Sales	747,234	1,609,057	2,990,502	3,537,162
Liquid Filters [Member]
Net Sales	8,453,136	1,988,971	13,493,469	2,452,248
Development Projects [Member]
Net Sales	$ 96,815		$ 234,413

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

+ Details

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- Details

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