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Note 11 - Geographic And Segment Information (Details) - Cost of Goods Sold By Segment (USD $) | 3 Months Ended
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Nov. 30, 2013 | Nov. 30, 2012
Direct cost of goods sold |  |  |  |
Cost of Goods Sold | $ 4,158,031 |  | $ 3,690,972 |
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |  |  |
Direct cost of goods sold |  |  |  |
Cost of Goods Sold | 3,081,764 |  | 2,644,295 |
% of Product Sales | 53.60% | [1] | 55.10% | [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |  |  |
Direct cost of goods sold |  |  |  |
Cost of Goods Sold | 449,464 |  | 439,673 |
% of Product Sales | 80.30% | [1] | 88.60% | [1]
Indirect Cost of Goods Sold [Member] |  |  |  |
Direct cost of goods sold |  |  |  |
Cost of Goods Sold | $ 626,803 |  | $ 607,004 |
% of Product Sales |  | [1] |  | [1]
[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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Namespace Prefix: | ntic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ntic_DirectCostOfGoodsSoldAbstract
Namespace Prefix: | ntic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_CostOfGoodsSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration