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Related Party Transactions (Details Narrative) - CAD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sentient [Member]
Disclosure of transactions between related parties [line items]
Number of common shares beneficially owned	369,809,820
Number of common shares beneficially owned, percentage	46.93%
Contemporary Amperex Technology Limited [Member]
Disclosure of transactions between related parties [line items]
Number of common shares beneficially owned	200,000,000
Number of common shares beneficially owned, percentage	25.38%
Chairman as Consultant [Member]
Disclosure of transactions between related parties [line items]
Fees charged by a legal firm	$ 9	$ 78

X

- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	NAN_IfrsSaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	NAN_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of fees paid or payable to related party for professional services.

+ References

No definition available.

+ Details

Name:	NAN_RelatedPartyTransactionsProfessionalFeesExpense
Namespace Prefix:	NAN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	NAN_SaleOfStockSharesOwnedAfterTransaction
Namespace Prefix:	NAN_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=NAN_SentientMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=NAN_ContemporaryAmperexTechnologyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=NAN_ChairmanAsConsultantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: