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Note 1 - Allowance For Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Trade Receivable, Allowance for Doubtful Accounts	$ 40,000	$ 20,000	$ 20,000
Bad debts	6,000	107,000	21,000
Adjustment to provision	(6,000)	(87,000)	(21,000)
Trade Receivable, Allowance for Doubtful Accounts	$ 40,000	$ 40,000	$ 20,000

X

- Definition

Represents the allowance for doubtful accounts receivable adjustment to provision.

+ References

No definition available.

+ Details

Name:	ntic_AllowanceForDoubtfulAccountsReceivableAdjustmentToProvision
Namespace Prefix:	ntic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents provision for doubtful accounts gross of adjustments.

+ References

No definition available.

+ Details

Name:	ntic_ProvisionForDoubtfulAccountsGrossOfAdjustments
Namespace Prefix:	ntic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.4)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 4



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant