Note 5 - Patents and Trademarks, Net (Details) - Patents and Trademarks, Net (USD $)	Feb. 28, 2015	Aug. 31, 2014
Finite-Lived Intangible Assets [Line Items]
	$ 1,260,574us-gaap_FiniteLivedIntangibleAssetsNet	$ 1,197,700us-gaap_FiniteLivedIntangibleAssetsNet
Patents and Trademarks Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and trademarks	2,394,546	2,287,840
Less accumulated amortization	(1,133,972)	(1,090,140)
	$ 1,260,574	$ 1,197,700

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=ntic_PatentsAndTrademarksIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: