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Related Parties and Information about Significant Non-Recurring Events and A tipycal/Unusual Transactions - Additional Information (Detail)	Dec. 31, 2018 EUR (€)
Disclosure of transactions between related parties [abstract]
Loans and/or guarantees provided to key management personnel	€ 0

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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- Definition

Loans or guarantees to key management personnel.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant