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Deferred Income for Government Grants - Summary of Changes in the Carrying Amount of Deferred Income for Government Grants (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Accruals And Deferred Income 1 [Abstract] |  |
Deferred income beginning balance | € 12,754 | € 12,458
Additions | 1,204 | 1,725
Credit to profit or loss | (1,716) | (1,429)
Deferred income ending balance | € 12,242 | € 12,754

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- Definition The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ntz_
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- Definition Deferred income additions. + References No definition available. + Details
Name: | ntz_DeferredIncomeAdditions
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase decrease in deferred income. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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