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Other Payables - Additional Information (Detail) - EUR (€) € in Thousands		12 Months Ended
	Mar. 02, 2020	Dec. 31, 2022	Feb. 28, 2020
Trade and other current payables [abstract]
Payment received from parents majority shareholder		€ 2,500
Subscription price of a future rights issue			€ 15,000
Partial receipt of subscription price of a future rights issue	€ 2,500
Amount paid back to parent's majority shareholder		€ 2,500

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- Definition

Amount Paid Back to Parent's Majority Shareholder.

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

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- Definition

Partial receipt of subscription price of a future rights issue.

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No definition available.

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Name:	ntz_PartialReceiptOfSubscriptionPriceOfAFutureRightsIssue
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Payment received from parent's majority shareholder.

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No definition available.

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Name:	ntz_PaymentReceivedFromParentsMajorityShareholder
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Subscription price of a future Rights issue.

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No definition available.

+ Details

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