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Note 13 - Net Sales by Segment (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
ZERUST [Member] |  |  |
Net sales by segment | $ 26,042,909 | $ 23,845,288 | $ 20,457,198
NaturTec [Member] |  |  |
Net sales by segment | 4,279,784 | 2,980,820 | 2,044,666
Net sales by segment | $ 30,322,693 | $ 26,826,108 | $ 22,501,864

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ntic_ZERUSTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ntic_NaturTecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |