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Selling Expenses - Additional Information (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Selling Expenses [Abstract]
Lease incentives	€ 635	€ 1,515	€ 1,799

X

- Definition

Abstract represents disclosure of selling expenses.

+ References

No definition available.

+ Details

Name:	ntz_DisclosureOfSellingExpensesAbstract
Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Lease incentive.

+ References

No definition available.

+ Details

Name:	ntz_LeaseIncentive
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration