XML 162 R211.htm IDEA: XBRL DOCUMENT
v3.20.1

Subsequents Events - Additional Information (Detail) - Non adjusting event after reporting date [member] - EUR (€) € in Thousands | Mar. 02, 2020 | Feb. 28, 2020
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Disclosure of non-adjusting events after reporting period [line items] |  |
Subscription price of a future rights issue |  | € 15,000
Partial receipt of subscription price of a future rights issue | € 2,500 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + 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 Partial receipt of subscription price of a future rights issue. + References No definition available. + Details
Name: | ntz_PartialReceiptOfSubscriptionPriceOfAFutureRightsIssue
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Subscription price of a future Rights issue. + References No definition available. + Details
Name: | ntz_SubscriptionPriceOfAFutureRightsIssue
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ntz_NonAdjustingEventAfterReportingDateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |