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Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment (USD $) | 12 Months Ended
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Aug. 31, 2014 | Aug. 31, 2013
Direct cost of goods sold |  |
Indirect cost of goods sold | $ 17,803,153 | $ 15,473,212
Indirect cost of goods sold | 66.40% | 68.80%
ZERUST [Member] | Direct Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Indirect cost of goods sold | 12,941,234 | 11,408,604
Indirect cost of goods sold | 54.30% | 55.80%
Natur-Tec [Member] | Direct Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Indirect cost of goods sold | 2,234,736 | 1,731,398
Indirect cost of goods sold | 75.00% | 84.70%
Indirect Cost of Goods Sold [Member] |  |
Direct cost of goods sold |  |
Indirect cost of goods sold | $ 2,627,183 | $ 2,333,210

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- Definition Represents the cost of goods sold as a percentage of product sales. + References No definition available. + Details
Name: | ntic_CostOfGoodsSoldAsPercentageOfProductSales
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