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Note 11 - Segment and Geographic Information - Fees for Services Provided to Joint Ventures by Geographic Location as a Percentage of Total Fees (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020
Fees | $ 5,964,260 | $ 4,612,885
Percentage of Total Fees | 100.00% | 100.00%
GERMANY |  |
Fees | $ 920,902 | $ 843,752
Percentage of Total Fees | 15.40% | 18.30%
JAPAN |  |
Fees | $ 826,403 | $ 628,889
Percentage of Total Fees | 13.90% | 13.60%
POLAND |  |
Fees | $ 798,570 | $ 553,198
Percentage of Total Fees | 13.40% | 12.00%
SWEDEN |  |
Fees | $ 528,755 | $ 372,017
Percentage of Total Fees | 8.90% | 8.10%
FRANCE |  |
Fees | $ 435,032 | $ 310,661
Percentage of Total Fees | 7.30% | 6.70%
THAILAND |  |
Fees | $ 399,563 | $ 328,452
Percentage of Total Fees | 6.70% | 7.10%
INDIA |  |
Fees | $ 392,074 | $ 250,976
Percentage of Total Fees | 6.60% | 5.40%
CZECHIA |  |
Fees | $ 377,395 | $ 270,032
Percentage of Total Fees | 6.30% | 5.90%
KOREA, REPUBLIC OF |  |
Fees | $ 317,042 | $ 266,703
Percentage of Total Fees | 5.30% | 5.80%
UNITED KINGDOM |  |
Fees | $ 316,786 | $ 255,121
Percentage of Total Fees | 5.30% | 5.50%
FINLAND |  |
Fees | $ 298,663 | $ 256,375
Percentage of Total Fees | 5.00% | 5.60%
INDONESIA |  |
Fees | $ 122,513 | $ 99,543
Percentage of Total Fees | 2.10% | 2.20%
Other Countries [Member] |  |
Fees | $ 230,562 | $ 177,167
Percentage of Total Fees | 3.80% | 3.80%

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_JP
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_SE
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_TH
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |