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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 ($) | 12 Months Ended
--- | ---
Aug. 31, 2022 | Aug. 31, 2021
Fees | $ 5,767,682 | $ 5,964,260
Percentage of Total Fees | 100.00% | 100.00%
GERMANY |  |
Fees | $ 834,725 | $ 920,902
Percentage of Total Fees | 14.50% | 15.40%
POLAND |  |
Fees | $ 730,523 | $ 798,570
Percentage of Total Fees | 12.70% | 13.40%
JAPAN |  |
Fees | $ 669,371 | $ 826,403
Percentage of Total Fees | 11.60% | 13.90%
FRANCE |  |
Fees | $ 448,579 | $ 435,032
Percentage of Total Fees | 7.80% | 7.30%
SWEDEN |  |
Fees | $ 447,441 | $ 528,755
Percentage of Total Fees | 7.80% | 8.90%
THAILAND |  |
Fees | $ 344,649 | $ 399,563
Percentage of Total Fees | 6.00% | 6.70%
UNITED KINGDOM |  |
Fees | $ 342,488 | $ 316,786
Percentage of Total Fees | 5.90% | 5.30%
FINLAND |  |
Fees | $ 340,783 | $ 298,663
Percentage of Total Fees | 5.90% | 5.00%
CZECHIA |  |
Fees | $ 300,257 | $ 377,395
Percentage of Total Fees | 5.20% | 6.30%
KOREA, REPUBLIC OF |  |
Fees | $ 270,309 | $ 317,042
Percentage of Total Fees | 4.70% | 5.30%
INDONESIA |  |
Fees | $ 156,476 | $ 122,513
Percentage of Total Fees | 2.70% | 2.10%
INDIA |  |
Fees | $ 0 | $ 392,074
Percentage of Total Fees | 0.00% | 6.60%
Other Countries [Member] |  |
Fees | $ 882,081 | $ 230,562
Percentage of Total Fees | 15.20% | 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
Name: | ntic_TotalFeesForServicesProvidedToJointVenturesGeographicLocation
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_TH
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_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_ID
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=ntic_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |