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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 ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020
Fees | $ 1,589,621 | $ 876,706 | $ 4,388,866 | $ 3,491,244
Percentage of Total Fees | 100.00% | 100.00% | 100.00% | 100.00%
GERMANY |  |  |  |
Fees | $ 232,026 | $ 199,877 | $ 692,770 | $ 620,106
Percentage of Total Fees | 14.60% | 22.80% | 15.80% | 17.80%
POLAND |  |  |  |
Fees | $ 226,174 | $ 75,118 | $ 626,527 | $ 441,011
Percentage of Total Fees | 14.20% | 8.60% | 14.30% | 12.60%
JAPAN |  |  |  |
Fees | $ 200,270 | $ 139,268 | $ 561,725 | $ 453,347
Percentage of Total Fees | 12.60% | 15.90% | 12.80% | 13.00%
SWEDEN |  |  |  |
Fees | $ 127,710 | $ 51,767 | $ 365,095 | $ 259,671
Percentage of Total Fees | 8.00% | 5.90% | 8.30% | 7.40%
FRANCE |  |  |  |
Fees | $ 119,172 | $ 61,716 | $ 322,717 | $ 241,056
Percentage of Total Fees | 7.50% | 7.00% | 7.40% | 6.90%
THAILAND |  |  |  |
Fees | $ 108,842 | $ 67,919 | $ 306,151 | $ 261,132
Percentage of Total Fees | 6.90% | 7.70% | 7.00% | 7.50%
INDIA |  |  |  |
Fees | $ 107,021 | $ 24,842 | $ 290,713 | $ 187,826
Percentage of Total Fees | 6.70% | 2.80% | 6.60% | 5.40%
CZECHIA |  |  |  |
Fees | $ 109,680 | $ 46,709 | $ 268,571 | $ 215,923
Percentage of Total Fees | 6.90% | 5.30% | 6.10% | 6.20%
UNITED KINGDOM |  |  |  |
Fees | $ 113,886 | $ 52,484 | $ 247,560 | $ 202,241
Percentage of Total Fees | 7.20% | 6.00% | 5.60% | 5.80%
KOREA, REPUBLIC OF |  |  |  |
Fees | $ 78,507 | $ 54,951 | $ 241,805 | $ 206,272
Percentage of Total Fees | 4.90% | 6.30% | 5.50% | 5.90%
FINLAND |  |  |  |
Fees | $ 75,577 | $ 52,870 | $ 223,356 | $ 194,813
Percentage of Total Fees | 4.80% | 6.00% | 5.10% | 5.60%
Other Countries [Member] |  |  |  |
Fees | $ 90,756 | $ 49,185 | $ 241,876 | $ 207,846
Percentage of Total Fees | 5.70% | 5.60% | 5.50% | 6.00%

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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_StatementGeographicalAxis=country_IN
Namespace Prefix: |
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Namespace Prefix: |
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Namespace Prefix: |
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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