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Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
Cost of goods sold	$ 52,099,121	$ 51,090,298
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold	35,297,352	34,673,146
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold	13,645,992	12,859,343
Indirect Cost of Goods Sold [Member]
Cost of goods sold	$ 3,155,777	$ 3,557,809

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ntic_NaturTecMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	ntic_CostOfGoodsSoldTypeAxis=ntic_IndirectCostOfGoodsSoldMember
Namespace Prefix:
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Balance Type:
Period Type: