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Note 12 - Commitments and Contingencies (Details Textual)	May 31, 2024	May 31, 2023
Entity Wide Trade Joint Venture Receivables, Three Joint Ventures, Percentage	54.80%
Entity Wide Trade Joint Venture Receivables, Two Joint Ventures, Percentage		65.10%

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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