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Note 12 - Retirement Plan (Details Textual) - USD ($) | Aug. 31, 2024 | Aug. 31, 2023
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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 | $ 332,726 | $ 289,235

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

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + 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