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Deferred Income for Government Grants - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2024
Disclosure Of Property Plant And Equipment [Line Items]
Property, plant and equipment prohibited from selling period	5 years

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Property, Plant and Equipment Prohibited from Selling Period

+ References

No definition available.

+ Details

Name:	ntz_PropertyPlantAndEquipmentProhibitedFromSellingPeriod
Namespace Prefix:	ntz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration