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Note 10 - Geographic and Segment Information (Details) - Net Sales by Segment (USD $)	3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales by segment	$ 6,920,820	$ 5,877,033	$ 19,448,928	$ 16,415,130
ZERUST [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales by segment	5,992,095	5,418,271	17,296,159	14,923,966
Natur-Tec [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales by segment	$ 928,725	$ 458,762	$ 2,152,769	$ 1,491,164

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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)

-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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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