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Note 11 - Geographic And Segment Information (Detail) - Net Sales By Segment: (USD $) | 3 Months Ended
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Nov. 30, 2012 | Nov. 30, 2011
Net Sales | $ 5,291,747 | $ 4,832,114
ZERUST [Member] |  |
Net Sales | 4,795,283 | 4,452,646
Natur-Tec [Member] |  |
Net Sales | $ 496,464 | $ 379,468

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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=6880815&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
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration