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Note 12 - Geographic And Segment Information (Detail) - Cost of Goods Sold By Segment: (USD $) | 12 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011
Direct cost of goods sold |  |
Cost of Goods Sold | $ 14,528,785 | $ 12,768,640
% of Product Sales | 63.80% | 65.40%
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Cost of Goods Sold | 10,748,865 | 10,087,637
% of Product Sales | 51.30% | 54.40%
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Cost of Goods Sold | 1,585,731 | 702,608
% of Product Sales | 87.60% | 71.40%
Indirect Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Cost of Goods Sold | $ 2,194,190 | $ 1,978,395

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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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Namespace Prefix: | ntic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | ntic_
Data Type: | xbrli:stringItemType
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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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Namespace Prefix: | us-gaap_
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