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Note 15 - Income Taxes - Reconciliation of the Total Amounts of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Gross unrecognized tax benefits – beginning balance	$ 238,000	$ 203,000
Gross increases (decreases) - prior period tax positions	(4,000)	15,000
Gross increases – current period tax positions	16,000	20,000
Gross unrecognized tax benefits – ending balance	$ 250,000	$ 238,000

X

- Definition

Amount of increase (decrease) in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntic_
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Balance Type:	credit
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X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

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