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Note 3 - NTI ASEAN (Details)				1 Months Ended
	Aug. 31, 2013 NTI ASEAN [Member]	Sep. 30, 2012 NTI ASEAN [Member]	Aug. 31, 2012 NTI ASEAN [Member]	Sep. 30, 2012 Capitalization Rate To Determine Fair Value of NTI Asean [Member]
Note 3 - NTI ASEAN (Details) [Line Items]
Equity Method Investment, Ownership Percentage	10.00%		50.00%
Business Acquisition, Percentage of Voting Interests Acquired		10.00%
Business Acquisition, Ownership Percentage Subsequent to Acquisition		60.00%
Fair Value Inputs, Discount Rate				25.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee subsequent to the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntic_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	ntic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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X

- 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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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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