Note 12 - Commitments and Contingencies (Details Textual)	Nov. 30, 2022	Nov. 30, 2021
Entity Wide Trade Joint Venture Receivables, Two Joint Ventures, Percentage	47.40%	42.40%

Percentage of total trade joint venture receivables accounted for by two joint ventures.

No definition available.

Name:	ntic_EntityWideTradeJointVentureReceivablesTwoJointVenturesPercentage
Namespace Prefix:	ntic_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant