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Note 10 - Geographic And Segment Information (Details) - Cost of Goods Sold by Segment (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2014 | Feb. 28, 2013
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of goods sold | $ 4,051,833 |  | $ 3,633,913 |  | $ 8,209,864 |  | $ 7,324,885 |
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of goods sold | 2,965,790 |  | 2,623,070 |  | 6,047,554 |  | 5,267,365 |
Cost of goods sold as a percentage of product sales | 53.40% | [1] | 55.70% | [1] | 53.50% | [1] | 55.40% | [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of goods sold | 490,573 |  | 453,147 |  | 940,037 |  | 892,820 |
Cost of goods sold as a percentage of product sales | 73.90% | [1] | 84.60% | [1] | 76.80% | [1] | 86.50% | [1]
Indirect Cost of Goods Sold [Member] |  |  |  |  |  |  |  |
Direct cost of goods sold |  |  |  |  |  |  |  |
Cost of goods sold | $ 595,470 |  | $ 557,696 |  | $ 1,222,273 |  | $ 1,164,700 |
Cost of goods sold as a percentage 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 foreach 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
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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=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
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