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Note 11 - Geographic And Segment Information (Details) - Net Sales By Segment (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net Sales | $ 5,877,033 | $ 7,804,904 | $ 16,415,130 | $ 17,611,346
ZERUST [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net Sales | 5,418,271 | 7,220,258 | 14,923,966 | 16,243,683
Natur-Tec [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net Sales | $ 458,762 | $ 584,646 | $ 1,491,164 | $ 1,367,663

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- 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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