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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
	Nov. 30, 2022	Nov. 30, 2021
Germany	$ 1,181,805	$ 1,258,858
Germany	100.00%	100.00%
GERMANY
Germany	$ 193,828	$ 218,430
Germany	16.40%	17.40%
POLAND
Germany	$ 186,696	$ 176,927
Germany	15.80%	14.10%
JAPAN
Germany	$ 147,920	$ 166,807
Germany	12.50%	13.30%
FRANCE
Germany	$ 109,357	$ 116,295
Germany	9.30%	9.20%
SWEDEN
Germany	$ 100,436	$ 108,070
Germany	8.50%	8.60%
FINLAND
Germany	$ 90,432	$ 80,173
Germany	7.70%	6.40%
THAILAND
Germany	$ 82,956	$ 87,554
Germany	7.00%	7.00%
CZECHIA
Germany	$ 80,332	$ 70,098
Germany	6.80%	5.60%
KOREA, REPUBLIC OF
Germany	$ 63,395	$ 62,626
Germany	5.40%	5.00%
UNITED KINGDOM
Germany	$ 57,691	$ 94,927
Germany	4.90%	7.50%
Other Countries [Member]
Germany	$ 68,762	$ 76,951
Germany	5.70%	5.90%

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

X

- Details

Name:	srt_StatementGeographicalAxis=country_DE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_PL
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_JP
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_FR
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_SE
Namespace Prefix:
Data Type:	na
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X

- Details

Name:	srt_StatementGeographicalAxis=country_FI
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_TH
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_CZ
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_KR
Namespace Prefix:
Data Type:	na
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X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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