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Note 14 - Related Party Transactions (Details Textual) - Bioplastic Polymers LLC [Member] - USD ($) | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
Consulting Payment Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 100,000 |
Royalty Payment Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 31,463 | $ 21,327

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ntic_BioplasticPolymersLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=ntic_RoyaltyPaymentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |