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Note 12 - Retirement Plan (Details Textual) - USD ($) | 12 Months Ended
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Aug. 31, 2021 | Aug. 31, 2020
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 15.00%
Defined Contribution Plan Maximum Amount of Employees Contributions Percent |  | 50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 3.50%
Defined Contribution Plan, Cost | $ 237,499 | $ 234,534

X
- Definition Maximum percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | ntic_DefinedContributionPlanMaximumAmountOfEmployeesContributionsPercent
Namespace Prefix: | ntic_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration