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Note 13 - Retirement Plan (Detail) (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011
Defined Contribution Plan, Employee Contribution Percent, Max | 15.00% |
Defined Contribution Plan, Maximum Contribution Per Employee, Percent | 50.00% |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent | 3.50% |
Defined Contribution Plan, Cost Recognized (in Dollars) | $ 166,201 | $ 150,223

X
- Definition Maximum percentage of the employee's salary in which the employee may contribute to the plan. + References No definition available. + Details
Name: | ntic_DefinedContributionPlanEmployeeContributionPercentMax
Namespace Prefix: | ntic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee contributions, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | ntic_DefinedContributionPlanMaximumAmountOfEmployeesContributionsPercent
Namespace Prefix: | ntic_
Data Type: | num:percentItemType
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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration