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Note 11 - Geographic And Segment Information (Detail) - Cost of Goods Sold By Segment: (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | $ 3,633,913 |  | $ 3,480,082 |  | $ 7,324,885 |  | $ 6,689,558 |
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | 2,623,070 |  | 2,569,588 |  | 5,267,365 |  | 5,027,387 |
% of Product Sales | 55.70% | [1] | 56.20% | [1] | 55.40% | [1] | 55.70% | [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | 453,147 |  | 361,704 |  | 892,820 |  | 658,265 |
% of Product Sales | 84.60% | [1] | 89.60% | [1] | 86.50% | [1] | 84.10% | [1]
Indirect Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | $ 557,696 |  | $ 548,790 |  | $ 1,164,700 |  | $ 1,003,906 |
[1] | The percent of segment sales is calculated by dividing the direct cost of goods sold for each individual segment category by the net sales for each segment category.

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- Definition Represents the cost of goods sold as a percentage of product sales. + References No definition available. + Details
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- Details
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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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