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Note 18 - Fair Value Measurements (Details) (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2014 | Aug. 31, 2013
Disclosure Text Block [Abstract] |  |
Fair Value Assets, Transfers Level 1, Level 2, Level 3 | $ 0 | $ 0

X
- Definition Transfers between Level1,Level2 or Level3 + References No definition available. + Details
Name: | ntic_FairValueAssetsTransfersLevel1Level2Level3
Namespace Prefix: | ntic_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration