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Note 12 - Retirement Plan (Details Textual) - USD ($)	12 Months Ended
	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

X

- 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