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Note 11 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment (USD $)	3 Months Ended
	Nov. 30, 2014		Nov. 30, 2013
Note 11 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	$ 4,806,611us-gaap_CostOfGoodsSold		$ 4,158,031us-gaap_CostOfGoodsSold
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Note 11 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	3,338,588us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember		3,081,764us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember
% of Product Sales	53.50%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	[1]	53.60%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	[1]
Direct Cost of Goods Sold [Member] | Natur-Tec [Member]
Note 11 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	782,575us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember		449,464us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember
% of Product Sales	80.20%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	[1]	80.30%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	[1]
Indirect Cost of Goods Sold [Member]
Note 11 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	$ 685,448us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_IndirectCostOfGoodsSoldMember		$ 626,803us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_IndirectCostOfGoodsSoldMember
% 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.

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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

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