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Note 11 - Geographic and Segment Information (Details) - Net Sales by Segment (USD $) | 3 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Net sales by segment | $ 7,214,095 us-gaap_SalesRevenueNet | $ 6,309,100 us-gaap_SalesRevenueNet
ZERUST [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Net sales by segment | 6,238,071 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = ntic_ZERUSTMember | 5,749,013 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = ntic_ZERUSTMember
Natur-Tec [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Net sales by segment | $ 976,024 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = ntic_NaturTecMember | $ 560,087 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = ntic_NaturTecMember

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + 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_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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