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Note 14 - Income Taxes - Reconciliation of the Total Amounts of Unrecognized Tax Benefits (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Gross unrecognized tax benefits – beginning balance | $ 242,000 | $ 250,000
Gross decreases – prior period tax positions | 1,000 | (12,000)
Gross increases – current period tax positions | 5,000 | 4,000
Gross unrecognized tax benefits – ending balance | $ 248,000 | $ 242,000

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- Definition Amount of increase (decrease) in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References No definition available. + Details
Name: | ntic_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromPriorPeriodTaxPositions
Namespace Prefix: | ntic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration