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Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 31, 2019
Notes Tables |
Property and Equipment Useful Life [Table Text Block] | <div style="display: inline; font-family: times new roman; font-size: 10pt"><table cellspacing="0" cellpadding="0" style="; border-collapse: collapse; text-indent: 0px; min-; min-width: 700px;"> <tr style="vertical-align: bottom; background-color: White"> <td style="width: 50%; font-size: 10pt; text-align: left; padding-left: 1.7in">Buildings and improvements (years)</td> <td style="width: 1%; font-size: 10pt"> </td> <td style="width: 4%; font-size: 10pt; text-align: left"> </td> <td style="width: 4%; font-size: 10pt; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5</div></td> <td style="width: 4%; font-size: 10pt; text-align: center"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">-</div></td> <td style="width: 37%; font-size: 10pt; text-align: left"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">30</div></td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="font-size: 10pt; text-align: left; padding-left: 1.7in">Machinery and equipment (years)</td> <td style="font-size: 10pt"> </td> <td style="font-size: 10pt; text-align: left"> </td> <td style="font-size: 10pt; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">3</div></td> <td style="font-size: 10pt; text-align: center"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">-</div></td> <td style="font-size: 10pt; text-align: left"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">10</div></td> </tr> </table></div>

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- Definition Tabular disclosure of property and equipment useful life. + References No definition available. + Details
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Namespace Prefix: | ntic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration