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Subsequents Events - Additional Information (Detail) - Non adjusting event after reporting date [member] - EUR (€) € in Thousands	Mar. 02, 2020	Feb. 28, 2020
Disclosure of non-adjusting events after reporting period [line items]
Subscription price of a future rights issue		€ 15,000
Partial receipt of subscription price of a future rights issue	€ 2,500

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Partial receipt of subscription price of a future rights issue.

+ References

No definition available.

+ Details

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

X

- Definition

Subscription price of a future Rights issue.

+ References

No definition available.

+ Details

Name:	ntz_SubscriptionPriceOfAFutureRightsIssue
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ntz_NonAdjustingEventAfterReportingDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: