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Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 31, 2016
Notes Tables |
Property and Equipment Useful Life [Table Text Block] |
Buildings and improvements (years) |  | 5 | - | 30 |
Machinery and equipment (years) |  | 3 | - | 10 |

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

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