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Note 11 - Geographic And Segment Information (Details) - Cost of Goods Sold By Segment (USD $) | 3 Months Ended | 9 Months Ended
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May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | $ 4,054,364 |  | $ 4,143,514 |  | $ 11,379,249 |  | $ 10,833,072 |
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | 3,115,980 |  | 3,046,644 |  | 8,383,345 |  | 8,074,031 |
% of Product Sales | 57.50% | [1] | 42.20% | [1] | 56.20% | [1] | 49.70% | [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | 367,485 |  | 501,749 |  | 1,260,305 |  | 1,160,014 |
% of Product Sales | 80.10% | [1] | 85.80% | [1] | 84.50% | [1] | 84.80% | [1]
Indirect Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of Goods Sold | $ 570,899 |  | $ 595,121 |  | $ 1,735,599 |  | $ 1,599,027 |
% of Product Sales |  | [1] |  | [1] |  | [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