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Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment (USD $)	3 Months Ended				6 Months Ended
	Feb. 28, 2015		Feb. 28, 2014		Feb. 28, 2015	Feb. 28, 2014
Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	$ 4,657,740us-gaap_CostOfGoodsSold		$ 4,051,833us-gaap_CostOfGoodsSold		$ 9,464,351us-gaap_CostOfGoodsSold	$ 8,209,864us-gaap_CostOfGoodsSold
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	3,171,103us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember		2,965,790us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember		6,509,691us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	6,047,554us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember
% of Product Sales	54.80%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	[1]	53.40%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	[1]	54.10%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember	53.50%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_ZERUSTMember
Direct Cost of Goods Sold [Member] | Natur-Tec [Member]
Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	719,048us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember		490,573us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember		1,501,623us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	940,037us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember
% of Product Sales	76.10%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	[1]	73.90%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	[1]	78.20%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember	76.80%ntic_CostOfGoodsSoldAsPercentageOfProductSales / ntic_CostOfGoodsSoldTypeAxis = ntic_DirectCostOfGoodsSoldMember / us-gaap_ProductOrServiceAxis = ntic_NaturTecMember
Indirect Cost of Goods Sold [Member]
Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]
Cost of Goods Sold	$ 767,589us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_IndirectCostOfGoodsSoldMember		$ 595,470us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_IndirectCostOfGoodsSoldMember		$ 1,453,037us-gaap_CostOfGoodsSold / ntic_CostOfGoodsSoldTypeAxis = ntic_IndirectCostOfGoodsSoldMember	$ 1,222,273us-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.

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- Definition

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+ References

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- 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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