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Deferred Income for Government Grants - Summary of Changes in the Carrying Amount of Deferred Income for Government Grants (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accruals And Deferred Income 1 [Abstract]
Deferred income beginning balance	€ 13,135	€ 12,242
Additions	88	2,757
Credit to profit or loss	(2,187)	(1,864)
Deferred income ending balance	€ 11,036	€ 13,135

X

- Definition

The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NoncurrentGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accruals And Deferred Income1 Abstract

+ References

No definition available.

+ Details

Name:	ntz_AccrualsAndDeferredIncome1Abstract
Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Deferred income additions.

+ References

No definition available.

+ Details

Name:	ntz_DeferredIncomeAdditions
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase decrease in deferred income.

+ References

No definition available.

+ Details

Name:	ntz_IncreaseDecreaseInDeferredIncome
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration