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Administrative Expenses - Summary of Administrative Expenses (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Selling, general and administrative expense [abstract]
Salaries	€ 20,023	€ 19,364
Consultancy	4,076	4,089
Travel expenses	2,712	3,210
Non deductibles and indirect taxes	2,022	2,331
Depreciation and amortization	1,301	1,668
Mail & Phone	675	745
Directors and auditors-fees	801	734
Cars cost	487	507
Printing & Stationery	457	500
Electronic data processing	96	118
Other	2,694	2,839
Total	€ 35,344	€ 36,105

X

- Definition

The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note.

+ References

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X

- Definition

The amount of expense arising from communication.

+ References

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-Number 1
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X

- Definition

The amount of expense relating to general and administrative activities of the entity.

+ References

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-Name IAS
-Number 1
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X

- References

No definition available.

+ Details

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X

- Definition

The amount of tax expense exclusive of income tax expense.

+ References

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-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 85
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-URIDate 2018-03-16

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X

- Definition

The amount of expense arising from travel.

+ References

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-Number 1
-IssueDate 2018-01-01
-Paragraph 112
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X

- 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 2018-01-01
-Paragraph 9
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_9&doctype=Standard
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X

- Definition

Directors and auditors remuneration expenses.

+ References

No definition available.

+ Details

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X

- Definition

Electronic data processing expenses.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

General and administrative depreciation and amortization expense.

+ References

No definition available.

+ Details

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X

- Definition

Other General And Administrative Expenses

+ References

No definition available.

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X

- Definition

Printing stationery expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Vehicle cost expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration