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Note 13 - Segment and Geographic Information - Fees for Services Provided to Joint Ventures by Geographic Location as a Percentage of Total Fees (Details) - USD ($) | 3 Months Ended
--- | ---
Nov. 30, 2021 | Nov. 30, 2020
Fees | $ 1,258,858 | $ 1,336,561
Percentage of Total Fees | 100.00% | 100.00%
GERMANY |  |
Fees | $ 218,430 | $ 228,826
Percentage of Total Fees | 17.30% | 17.10%
POLAND |  |
Fees | $ 176,927 | $ 189,410
Percentage of Total Fees | 14.10% | 14.20%
JAPAN |  |
Fees | $ 166,807 | $ 179,962
Percentage of Total Fees | 13.30% | 13.50%
FRANCE |  |
Fees | $ 116,292 | $ 105,907
Percentage of Total Fees | 9.20% | 7.90%
SWEDEN |  |
Fees | $ 108,070 | $ 90,489
Percentage of Total Fees | 8.60% | 6.80%
UNITED KINGDOM |  |
Fees | $ 94,927 | $ 61,915
Percentage of Total Fees | 7.50% | 4.60%
THAILAND |  |
Fees | $ 87,554 | $ 89,932
Percentage of Total Fees | 7.00% | 6.70%
FINLAND |  |
Fees | $ 80,173 | $ 76,283
Percentage of Total Fees | 6.40% | 5.70%
CZECHIA |  |
Fees | $ 70,098 | $ 69,353
Percentage of Total Fees | 5.60% | 5.20%
KOREA, REPUBLIC OF |  |
Fees | $ 62,626 | $ 85,079
Percentage of Total Fees | 5.00% | 6.40%
Other Countries [Member] |  |
Fees | $ 76,954 | $ 71,197
Percentage of Total Fees | 6.00% | 5.30%

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: | dtr-types: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
Name: | srt_StatementGeographicalAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_PL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_JP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_FR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_SE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_TH
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_FI
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_CZ
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_KR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=ntic_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |