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Note 12 - Geographic And Segment Information (Detail) - Fees For Services Provided to Joint Ventures By Geographic Location as a Percentage of Total Fees for Services Provided to Joint Ventures: (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Total Fees for Services Provided to Joint Ventures (in Dollars)	$ 4,622,912	$ 6,129,979
Percentage of Total Fees for Services Provided to Joint Ventures	100.00%	100.00%
Japan [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	1,022,386	1,184,205
Percentage of Total Fees for Services Provided to Joint Ventures	22.10%	19.30%
Germany [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	994,347	1,066,659
Percentage of Total Fees for Services Provided to Joint Ventures	21.50%	17.40%
Sweden [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	587,069	575,271
Percentage of Total Fees for Services Provided to Joint Ventures	12.70%	9.40%
France [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	517,708	727,653
Percentage of Total Fees for Services Provided to Joint Ventures	11.20%	11.90%
Finland [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	491,988	535,913
Percentage of Total Fees for Services Provided to Joint Ventures	10.60%	8.70%
Poland [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	456,837	317,020
Percentage of Total Fees for Services Provided to Joint Ventures	9.90%	5.20%
United Kingdom [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	309,938	306,586
Percentage of Total Fees for Services Provided to Joint Ventures	6.70%	5.00%
India [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	(192,758)	844,147
Percentage of Total Fees for Services Provided to Joint Ventures	(4.10%)	13.80%
Other Countries [Member]
Total Fees for Services Provided to Joint Ventures (in Dollars)	$ 435,398	$ 572,525
Percentage of Total Fees for Services Provided to Joint Ventures	9.40%	9.30%

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:	num: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