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Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
Direct Cost of Goods Sold [Member] | ZERUST [Member] |  |
Cost of goods sold | $ 15,588,133 | $ 14,399,456
Direct Cost of Goods Sold [Member] | NaturTec [Member] |  |
Cost of goods sold | 4,076,249 | 3,232,353
Indirect Cost of Goods Sold [Member] |  |
Cost of goods sold | 2,655,774 | 2,924,124
Cost of goods sold | $ 22,320,156 | $ 20,555,932

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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_ProductOrServiceAxis=ntic_ZERUSTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=ntic_NaturTecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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