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v3.20.2

Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 31, 2020
Notes Tables |
Property and Equipment Useful Life [Table Text Block] |
| Buildings and improvements |  | 5-30 years
| Machinery and equipment |  | 3-10 years

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- Definition Tabular disclosure of property and equipment useful life. + References No definition available. + Details
Name: | ntic_PropertyAndEquipmentUsefulLifeTableTextBlock
Namespace Prefix: | ntic_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration