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Note 11 - 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 $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | $ 1,917,947 |  | $ 734,337 |  | $ 5,535,105 |  | $ 3,477,715 |
Percentage of Total Fees for Services Provided to Joint Ventures | 100.00% |  | 100.00% |  | 100.00% |  | 100.00% |
China [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 524,724 | [1] |  | [1] | 1,468,622 | [1] |  | [1]
Percentage of Total Fees for Services Provided to Joint Ventures | 27.30% | [1] | 0.00% | [1] | 26.50% | [1] | 0.00% | [1]
Germany [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 250,000 |  | 241,338 |  | 742,213 |  | 742,171 |
Percentage of Total Fees for Services Provided to Joint Ventures | 13.00% |  | 32.90% |  | 13.40% |  | 21.30% |
Japan [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 177,432 |  | 260,026 |  | 548,618 |  | 763,548 |
Percentage of Total Fees for Services Provided to Joint Ventures | 9.30% |  | 35.40% |  | 9.90% |  | 22.00% |
Thailand [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 169,085 | [1] |  | [1] | 471,074 | [1] |  | [1]
Percentage of Total Fees for Services Provided to Joint Ventures | 8.80% | [1] | 0.00% | [1] | 8.50% | [1] | 0.00% | [1]
Korea [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 147,867 | [1],[2] | 61,152 | [1],[2] | 409,997 | [2] | 138,149 | [2]
Percentage of Total Fees for Services Provided to Joint Ventures | 7.70% | [1],[2] | 8.40% | [1],[2] | 7.40% | [2] | 4.00% | [2]
France [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 104,645 |  | 128,480 |  | 381,043 |  | 397,123 |
Percentage of Total Fees for Services Provided to Joint Ventures | 5.50% |  | 17.50% |  | 6.90% |  | 11.40% |
Poland [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 113,339 |  | 113,305 |  | 379,650 |  | 341,603 |
Percentage of Total Fees for Services Provided to Joint Ventures | 5.90% |  | 15.40% |  | 6.90% |  | 9.80% |
Sweden [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 141,000 |  | 141,257 |  | 305,619 |  | 446,191 |
Percentage of Total Fees for Services Provided to Joint Ventures | 7.40% |  | 19.20% |  | 5.50% |  | 12.80% |
Finland [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 85,246 |  | 127,344 |  | 245,426 |  | 378,751 |
Percentage of Total Fees for Services Provided to Joint Ventures | 4.40% |  | 17.30% |  | 4.40% |  | 10.90% |
United Kingdom [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | 65,193 |  | 83,879 |  | 168,005 |  | 244,017 |
Percentage of Total Fees for Services Provided to Joint Ventures | 3.40% |  | 11.40% |  | 3.10% |  | 7.00% |
India [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) |  |  | (492,602) |  |  |  | (192,758) |
Percentage of Total Fees for Services Provided to Joint Ventures | 0.00% |  | (67.10%) |  | 0.00% |  | (5.50%) |
Other Countries [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) | $ 139,416 |  | $ 70,158 |  | $ 414,838 |  | $ 218,920 |
Percentage of Total Fees for Services Provided to Joint Ventures | 7.30% |  | 9.60% |  | 7.50% |  | 6.30% |
[1] | Joint venture owned by NTI Asean.
[2] | Joint venture owned by NTI Asean as of May 31, 2013, but not as of May 31, 2012. NTI Asean results are not included on the consolidated financial statements for the three months ended May 31, 2012. (See Note 2)

X
- Definition Percentage of entity wide fees for services provided to joint ventures generated from geographic location. + References No definition available. + Details
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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
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Namespace Prefix: | ntic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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