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Note 6 - Investments in Joint Ventures (Details) (NTI ASEAN [Member])	Sep. 30, 2012	Aug. 31, 2012
NTI ASEAN [Member]
Note 6 - Investments in Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Business Acquisition, Percentage of Voting Interests Acquired	10.00%

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- Details

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Namespace Prefix:	ntic_
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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