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Related Parties and Information about Significant Non-Recurring Events and A tipycal/Unusual Transactions - Additional Information (Detail) | Dec. 31, 2019 EUR (€)
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Disclosure of transactions between related parties [abstract] |
Loans and/or guarantees provided to key management personnel | € 0

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans or guarantees to key management personnel. + References No definition available. + Details
Name: | ntz_LoansOrGuaranteesToKeyManagementPersonnel
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant