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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: |