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Note 12 - Segment and Geographic Information - Net Sales by Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Net sales by segment	$ 10,223,019	$ 8,686,575	$ 28,667,945	$ 23,415,946
ZERUST [Member]
Net sales by segment	8,368,487	7,185,955	23,681,192	19,548,974
NaturTec [Member]
Net sales by segment	$ 1,854,532	$ 1,500,620	$ 4,986,753	$ 3,866,972

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

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