XML 166 R156.htm IDEA: XBRL DOCUMENT v3.19.1

Financial Instruments - Fair Values and Risk Management - Additional Information (Detail) - EUR (€)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Jan. 01, 2017	Jun. 30, 2016	Jul. 31, 2015
Disclosure of detailed information about financial instruments [line items]
Unused credit lines	€ 24,010,000	€ 33,103,000		€ 34,451,000
Cash and cash equivalents	62,131,000	55,035,000		64,981,000
Long-term borrowings	€ 20,943,000	€ 25,717,000		€ 17,961,000
Fixed rate borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings at fixed rate	33.00%	29.00%
Top of range [member] | Non recourse factoring agreement [member]
Disclosure of detailed information about financial instruments [line items]
Sale of performing receivables			€ 55,000,000
Revolving basis and with non-recourse clause [member]
Disclosure of detailed information about financial instruments [line items]
Maximum amount of performing receivables to sell	€ 55,000,000
Credit risk [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of insures the collections risk related to a significant portion of trade receivable	80.00%
Percentage of uncollected outstanding balances of trade receivable in case of insolvency	85.00%
Maximum amount of customer receivables to bank in exchange of short-term credit					€ 55,000,000	€ 35,000,000
Percentage of insured receivables	15.00%
Credit risk [member] | Non recourse factoring agreement [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of insured receivables	0.00%
Currency risk [member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	€ 26,490,000	€ 16,991,000
Cash and cash equivalents	23,822,000	26,711,000
Gain on derivative financial instruments	143,000	339,000
Trade payables	27,443,000	21,197,000
Losses on derivative financial instruments	320,000	142,000
Currency risk [member] | Long-term borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Long-term borrowings	6,631,000	7,533,000
Currency risk [member] | Short-term borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Long-term borrowings	€ 7,184,000	€ 6,770,000

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph B13
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 54
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_CashAndCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of trade payables and other payables. [Refer: Trade payables; Other payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 54
-Subparagraph k
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_k&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_TradeAndOtherPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount due from customers for goods and services sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_TradeReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Gain on derivative financial instruments.

+ References

No definition available.

+ Details

Name:	ntz_GainOnDerivativeFinancialInstruments
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Losses on derivative financial instruments.

+ References

No definition available.

+ Details

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

X

- Definition

Maximum amount of performing receivables to sell

+ References

No definition available.

+ Details

Name:	ntz_MaximumAmountOfPerformingReceivablesToSell
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maximum contractual amount of accounts receivables to bank in exchange for short term credit.

+ References

No definition available.

+ Details

Name:	ntz_MaximumContractualAmountOfAccountsReceivablesToBankInExchangeForShortTermCredit
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of insured receivables.

+ References

No definition available.

+ Details

Name:	ntz_PercentageOfInsuredReceivables
Namespace Prefix:	ntz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of trade account receivables insured.

+ References

No definition available.

+ Details

Name:	ntz_PercentageOfTradeAccountReceivablesInsured
Namespace Prefix:	ntz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of uncollected outstanding balances of trade receivables to refund.

+ References

No definition available.

+ Details

Name:	ntz_PercentageOfUncollectedOutstandingBalancesOfTradeReceivablesToRefund
Namespace Prefix:	ntz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Sale of performing receivables

+ References

No definition available.

+ Details

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

X

- Definition

Unused Line Of Credit.

+ References

No definition available.

+ Details

Name:	ntz_UnusedLineOfCredit
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FixedInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis=ntz_NonRecourseFactoringAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ntz_RevolvingBasisAndWithNonrecourseClauseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ntz_TypesOfAgreementAxis=ntz_NonRecourseFactoringAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_LongtermBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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