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Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Cost of goods sold	$ 36,920,814	$ 31,609,274
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold	26,028,555	18,717,684
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold	7,717,429	10,168,051
Indirect Cost of Goods Sold [Member]
Cost of goods sold	$ 3,174,830	$ 2,723,539

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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- Details

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- Details

Name:	srt_ProductOrServiceAxis=ntic_NaturTecMember
Namespace Prefix:
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- Details

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