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Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold	$ 15,588,133	$ 14,399,456
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold	4,076,249	3,232,353
Indirect Cost of Goods Sold [Member]
Cost of goods sold	2,655,774	2,924,124
Cost of goods sold	$ 22,320,156	$ 20,555,932

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 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=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostOfGoodsSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ntic_CostOfGoodsSoldTypeAxis=ntic_DirectCostOfGoodsSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=ntic_ZERUSTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=ntic_NaturTecMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ntic_CostOfGoodsSoldTypeAxis=ntic_IndirectCostOfGoodsSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: