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Note 11 - Geographic And Segment Information (Details) - Cost of Goods Sold By Segment (USD $)	3 Months Ended
	Nov. 30, 2013		Nov. 30, 2012
Direct cost of goods sold
Cost of Goods Sold	$ 4,158,031		$ 3,690,972
ZERUST [Member] | Direct Cost of Goods Sold [Member]
Direct cost of goods sold
Cost of Goods Sold	3,081,764		2,644,295
% of Product Sales	53.60%	[1]	55.10%	[1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member]
Direct cost of goods sold
Cost of Goods Sold	449,464		439,673
% of Product Sales	80.30%	[1]	88.60%	[1]
Indirect Cost of Goods Sold [Member]
Direct cost of goods sold
Cost of Goods Sold	$ 626,803		$ 607,004
% of Product Sales		[1]		[1]
[1] The percent of segment sales is calculated by dividing the direct cost of goods sold for each individual segment category by the net sales for each segment category.

X

- Definition

Represents the cost of goods sold as a percentage of product sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntic_
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X

- Details

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

X

- Definition

Total costs related to goods produced and sold during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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