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Supplemental Cash Flow Information (Details Narrative) - CAD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Accrued exploration and evaluation expenditures | $ 716 | $ 135
Amount transferred from reserve to deficit | $ 25 |

X
- Definition The amount of accrued expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References No definition available. + Details
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Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount removed from reserve and transferred to retained earnings. + References No definition available. + Details
Name: | NAN_AmountRemovedFromReserveTransferredToRetainedEarnings
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | NAN_SupplementalCashFlowDisclosuresAbstract
Namespace Prefix: | NAN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration