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Note 11 - Geographic And Segment Information (Detail) - Net Sales By Segment: (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012
Net Sales | $ 5,246,350 | $ 4,974,328 | $ 10,538,097 | $ 9,806,442
ZERUST [Member] |  |  |  |
Net Sales | 4,710,412 | 4,570,779 | 9,505,695 | 9,023,425
Natur-Tec [Member] |  |  |  |
Net Sales | $ 535,938 | $ 403,549 | $ 1,032,402 | $ 783,017

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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