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Note 12 - Geographic and Segment Information (Details) - Fees for Services Provided to Joint Ventures by Geographic Location as a Percentage of Total Fees for Services Provided to Joint Ventures (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2014 | Aug. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | $ 8,142,863 | $ 7,352,980
Percentage of Total Fees for Services Provided to Joint Ventures | 100.00% | 100.00%
China [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 2,118,018 | 2,063,369
Percentage of Total Fees for Services Provided to Joint Ventures | 26.00% | 28.10%
Germany [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 1,032,234 | 1,004,958
Percentage of Total Fees for Services Provided to Joint Ventures | 12.70% | 13.70%
Japan [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 669,522 | 723,977
Percentage of Total Fees for Services Provided to Joint Ventures | 8.20% | 9.80%
Poland [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 652,291 | 525,282
Percentage of Total Fees for Services Provided to Joint Ventures | 8.00% | 7.10%
Thailand [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 604,316 | 621,807
Percentage of Total Fees for Services Provided to Joint Ventures | 7.40% | 8.40%
France [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 508,705 | 496,897
Percentage of Total Fees for Services Provided to Joint Ventures | 6.20% | 6.80%
Sweden [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 440,117 | 415,547
Percentage of Total Fees for Services Provided to Joint Ventures | 5.40% | 5.70%
United Kingdom [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 385,294 | 236,125
Percentage of Total Fees for Services Provided to Joint Ventures | 4.70% | 3.20%
India [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 364,918 |
Percentage of Total Fees for Services Provided to Joint Ventures | 4.50% | 0.00%
Finland [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 355,391 | 321,256
Percentage of Total Fees for Services Provided to Joint Ventures | 4.40% | 4.40%
Korea [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 315,916 | 393,307
Percentage of Total Fees for Services Provided to Joint Ventures | 3.90% | 5.30%
Czech [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 288,367 | 210,827
Percentage of Total Fees for Services Provided to Joint Ventures | 3.60% | 2.90%
Other Countries [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Fees for Services Provided to Joint Ventures (in Dollars) | $ 407,775 | $ 339,628
Percentage of Total Fees for Services Provided to Joint Ventures | 5.00% | 4.60%

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- Definition Percentage of entity wide fees for services provided to joint ventures generated from geographic location. + References No definition available. + Details
Name: | ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage
Namespace Prefix: | ntic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total fees for services provided to joint ventures by geographic locations. + References No definition available. + Details
Name: | ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation
Namespace Prefix: | ntic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration