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Note 12 - Geographic and Segment Information - Fees for Services Provided to Joint Ventures by Geographic Location as a Percentage of Total Fees (Details) - USD ($)	3 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Fees	$ 1,315,591	$ 1,485,429
Percentage of total fees	100.00%	100.00%
GERMANY
Fees	$ 203,000	$ 229,785
Percentage of total fees	15.40%	15.50%
POLAND
Fees	$ 149,204	$ 139,257
Percentage of total fees	11.30%	9.40%
THAILAND
Fees	$ 147,455	$ 223,741
Percentage of total fees	11.20%	15.10%
JAPAN
Fees	$ 146,037	$ 130,673
Percentage of total fees	11.10%	8.80%
KOREA, REPUBLIC OF
Fees	$ 105,378	$ 169,402
Percentage of total fees	8.00%	11.40%
FRANCE
Fees	$ 97,673	$ 89,673
Percentage of total fees	7.40%	6.00%
SWEDEN
Fees	$ 87,061	$ 72,961
Percentage of total fees	6.60%	4.90%
UNITED KINGDOM
Fees	$ 86,131	$ 108,911
Percentage of total fees	6.50%	7.30%
FINLAND
Fees	$ 76,336	$ 68,933
Percentage of total fees	5.80%	4.60%
CZECH REPUBLIC
Fees	$ 70,828	$ 57,553
Percentage of total fees	5.40%	3.90%
INDIA
Fees	$ 64,535	$ 80,451
Percentage of total fees	4.90%	5.40%
Other Countries [Member]
Fees	$ 81,953	$ 114,089
Percentage of total fees	6.20%	7.70%

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- 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_
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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_
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- Details

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Namespace Prefix:
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Name:	us-gaap_StatementGeographicalAxis=country_IN
Namespace Prefix:
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