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Administrative Expenses - Summary of Administrative Expenses (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Selling, general and administrative expense [abstract] |  |  |
Labour costs | € 20,663 | € 20,416 | € 19,447
Professional services costs | 3,340 | 2,979 | 3,151
Indirect taxes | 1,919 | 1,991 | 2,177
Directors and audit committee fees | 1,791 | 1,886 | 1,895
Office and software maintainance | 2,448 | 2,549 | 2,138
Depreciation and amortization | 2,212 | 1,364 | 1,462
Travel expenses | 2,279 | 2,677 | 2,689
Mail and Phone | 509 | 552 | 550
Printing and Stationery | 295 | 519 | 570
Car costs | 443 | 661 | 467
Government grants related to PPE | (1,333) | (145) | (59)
Other | 1,428 | 2,158 | 987
Total | € 35,994 | € 37,607 | € 35,474

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- Definition The amount of expense arising from communication. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense relating to general and administrative activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of fees paid or payable for professional services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The amount of tax expense exclusive of income tax expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from travel. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 9 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_9&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Directors and audit committee fees. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition General and administrative depreciation and amortization expense. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Government grants expenses. + References No definition available. + Details
Name: | ntz_GovernmentGrantsExpenses
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other General And Administrative Expenses + References No definition available. + Details
Name: | ntz_OtherGeneralAndAdministrativeExpenses
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Printing stationery expense. + References No definition available. + Details
Name: | ntz_PrintingStationeryExpense
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Software and office maintenance expenses. + References No definition available. + Details
Name: | ntz_SoftwareAndOfficeMaintenanceExpenses
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Vehicle cost expense. + References No definition available. + Details
Name: | ntz_VehicleCostExpense
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration