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Note 13 - Retirement Plan (Details) (USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Defined Contribution Plan Employee Contribution Percent Max	15.00%
Defined Contribution Plan Maximum Amount Of Employees Contributions Percent	50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	3.50%
Defined Contribution Plan, Cost Recognized (in Dollars)	$ 188,207	$ 175,016

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	ntic_DefinedContributionPlanMaximumAmountOfEmployeesContributionsPercent
Namespace Prefix:	ntic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration