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Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Cost of goods sold | $ 37,970,244 | $ 34,165,440
Direct Cost of Goods Sold [Member] | ZERUST [Member] |  |
Cost of goods sold | 21,505,335 | 24,326,493
Direct Cost of Goods Sold [Member] | NaturTec [Member] |  |
Cost of goods sold | 13,691,038 | 7,303,439
Indirect Cost of Goods Sold [Member] |  |
Cost of goods sold | $ 2,773,871 | $ 2,535,508

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ntic_CostOfGoodsSoldTypeAxis=ntic_DirectCostOfGoodsSoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=ntic_ZERUSTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ntic_CostOfGoodsSoldTypeAxis=ntic_IndirectCostOfGoodsSoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |