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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
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Nov. 30, 2014 | Nov. 30, 2013
Three Months Ended [Member] | CHINA |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | $ 516,139 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1] | $ 588,182 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1]
Percentage of Total Fees for Services Provided to Joint Ventures | 24.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1] | 27.90%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1]
Three Months Ended [Member] | GERMANY |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 238,321 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_DE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 263,555 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_DE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 11.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_DE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 12.50%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_DE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | POLAND |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 171,223 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_PL / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 164,567 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_PL / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 8.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_PL / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 7.80%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_PL / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | JAPAN |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 160,341 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_JP / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 173,282 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_JP / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 7.50%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_JP / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 8.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_JP / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | THAILAND |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 140,634 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_TH / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1] | 152,558 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_TH / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1]
Percentage of Total Fees for Services Provided to Joint Ventures | 6.60%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_TH / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1] | 7.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_TH / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember | [1]
Three Months Ended [Member] | FRANCE |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 133,379 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_FR / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 128,103 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_FR / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 6.30%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_FR / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 6.10%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_FR / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | UNITED KINGDOM |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 96,371 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 74,697 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 4.50%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 3.50%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | FINLAND |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 93,522 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_FI / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 105,202 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_FI / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 4.40%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_FI / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 5.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_FI / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | SWEDEN |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 86,920 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_SE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 109,970 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_SE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 4.10%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_SE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 5.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_SE / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | INDIA |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 69,291 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_IN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  |  |
Percentage of Total Fees for Services Provided to Joint Ventures | 3.20%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_IN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 0.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_IN / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] | Other Countries [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 236,030 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = ntic_OtherCountriesMember / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 188,108 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = ntic_OtherCountriesMember / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 11.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = ntic_OtherCountriesMember / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 8.90%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = ntic_OtherCountriesMember / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Three Months Ended [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | 2,133,670 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 2,109,648 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
Percentage of Total Fees for Services Provided to Joint Ventures | 100.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |  | 100.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementScenarioAxis = ntic_ThreeMonthsEndedMember |
KOREA, REPUBLIC OF |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Fees for Services Provided to Joint Ventures (in Dollars) (in Dollars) | $ 191,499 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_KR | [1] | $ 161,424 ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation / us-gaap_StatementGeographicalAxis = country_KR | [1]
Percentage of Total Fees for Services Provided to Joint Ventures | 9.00%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_KR | [1] | 7.70%ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage / us-gaap_StatementGeographicalAxis = country_KR | [1]
[1] | Joint venture owned by NTI Asean.

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

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_KR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=ntic_ThreeMonthsEndedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |