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Other current financial receivables - Summary of Other Current Financial Receivables (Details) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Other Current Receivables [Line Items] |  |
Other current financial receivables | € 1,348 |
Short-term borrowings [member] |  |
Disclosure Of Other Current Receivables [Line Items] |  |
Other current financial receivables | € 1,348 |

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- Definition The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_d&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure Of Other Current Receivables [line items]. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_ShorttermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |