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Note 11 - Significant Customers/Concentration (Details) - Sales by product line (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 2,949,605	$ 3,115,471	$ 9,154,674	$ 13,410,527
Ceramic Diesel Particulate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,386,565	1,909,013	4,858,841	9,765,972
Liquid Filters [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,440,849	1,042,101	3,679,719	3,328,719
Kiln Furniture [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 122,191	$ 164,357	$ 616,114	$ 315,836

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration