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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 | 9 Months Ended
--- | --- | ---
May 31, 2022 | May 31, 2021 | May 31, 2022 | May 31, 2021
Fees | $ 1,329,988 | $ 1,589,621 | $ 3,835,755 | $ 4,388,866
Percentage of Total Fees | 100.00% | 100.00% | 100.00% | 100.00%
GERMANY |  |  |  |
Fees | $ 204,316 | $ 232,026 | $ 639,738 | $ 692,770
Percentage of Total Fees | 15.40% | 14.60% | 16.70% | 15.80%
POLAND |  |  |  |
Fees | $ 171,181 | $ 226,174 | $ 520,807 | $ 626,527
Percentage of Total Fees | 12.90% | 14.20% | 13.60% | 14.30%
JAPAN |  |  |  |
Fees | $ 168,075 | $ 200,270 | $ 486,815 | $ 561,725
Percentage of Total Fees | 12.60% | 12.60% | 12.70% | 12.80%
FRANCE |  |  |  |
Fees | $ 123,869 | $ 119,172 | $ 355,827 | $ 322,717
Percentage of Total Fees | 9.30% | 7.50% | 9.30% | 7.40%
SWEDEN |  |  |  |
Fees | $ 130,681 | $ 127,710 | $ 337,929 | $ 365,095
Percentage of Total Fees | 9.80% | 8.00% | 8.80% | 8.30%
UNITED KINGDOM |  |  |  |
Fees | $ 89,363 | $ 113,886 | $ 271,027 | $ 247,560
Percentage of Total Fees | 6.70% | 7.20% | 7.10% | 5.60%
THAILAND |  |  |  |
Fees | $ 95,574 | $ 108,842 | $ 271,046 | $ 306,151
Percentage of Total Fees | 7.20% | 6.80% | 7.10% | 7.00%
FINLAND |  |  |  |
Fees | $ 92,036 | $ 75,577 | $ 257,635 | $ 223,356
Percentage of Total Fees | 6.90% | 4.80% | 6.70% | 5.10%
CZECHIA |  |  |  |
Fees | $ 84,797 | $ 109,680 | $ 224,280 | $ 268,571
Percentage of Total Fees | 6.40% | 6.90% | 5.80% | 6.10%
KOREA, REPUBLIC OF |  |  |  |
Fees | $ 78,542 | $ 78,507 | $ 205,342 | $ 241,805
Percentage of Total Fees | 5.90% | 4.90% | 5.40% | 5.50%
Other Countries [Member] |  |  |  |
Fees | $ 91,554 | $ 197,777 | $ 265,309 | $ 532,589
Percentage of Total Fees | 6.90% | 12.40% | 6.90% | 12.10%

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

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