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Note 20 - Fair Value Measurements (Details Textual) | 12 Months Ended
--- | ---
Aug. 31, 2015 USD ($)
Fair Value Assets Transfers Level 1 Level 2 Level 3 | $ 0

X
- Definition Transfers between Level 1, Level 2 or Level 3. + References No definition available. + Details
Name: | ntic_FairValueAssetsTransfersLevel1Level2Level3
Namespace Prefix: | ntic_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration