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Exploration and Evaluation Assets (Details Narrative) $ / shares in Units, kr in Thousands, $ in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 59 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 11, 2016 | Jan. 04, 2016 CAD ($) a | Dec. 31, 2015 CAD ($) | Mar. 04, 2012 CAD ($) | Mar. 04, 2012 DKK (kr) | Aug. 15, 2011 CAD ($) | Aug. 15, 2011 DKK (kr) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 DKK (kr) | Jan. 31, 2018 CAD ($) | Jan. 31, 2018 DKK (kr) | Sep. 30, 2018 CAD ($) | Sep. 30, 2017 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 DKK (kr) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 DKK (kr) | Dec. 31, 2015 CAD ($) | Dec. 31, 2015 DKK (kr) | Dec. 31, 2015 CAD ($) | Jan. 04, 2016 USD ($) a $ / shares | Apr. 05, 2010
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and exploration related cost |  |  |  |  |  |  |  |  |  |  |  | $ 12,778 | $ 10,626 |  |  |  |  |  |  |  |  |
Approved exploration expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,843 |  |  |  |  |  |  |  |
Reclamation deposit |  |  |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  |  |  |  |  |  |  |
Danish Krone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved exploration expenditures | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 9,367 |  |  |  |  |  |  |
Post Creek Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in property to be acquired on basis of option agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Advances payable annually on net smelter return royalties |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Payments made in advance |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | 33 | 43 |  |  |  |  |  |  |  |  |
Halcyon Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances payable annually on net smelter return royalties |  |  | $ 8 |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | 27 | 14 |  |  |  |  |  |  |  |  |
Quetico Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and exploration related cost |  |  |  |  |  |  |  |  |  |  |  | 61 |  |  |  |  |  |  |  |  |  |
Maniitsoq Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 13,181 | 10,558 |  |  |  |  |  |  |  |  |
Percentage of net smelter return royalties |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Percentage of net smelter return royalties after reduction |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Payment required to reduce net smelter return royalties |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Number of days from decision to commence commercial production to reduce net smelter return royalties |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |
Period of additional license application for years 11-13 |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Period of additional license application after year 13 |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Sulussugut License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 10,401 | 9,168 |  |  |  |  |  |  |  |  |
License fee paid |  |  |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of additional license application after first period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,808 |  | $ 26,116 |  |
Accumulated exploration credits |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,937 |  |  |  |  |  |  |  |
Approved exploration expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,746 |  |  |  |  |  |  |  |
Total carried credits |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,513 |  |  |  |  |  |  |  |
Sulussugut License [Member] | Danish Krone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License fee paid | kr |  |  |  |  |  |  | kr 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 83,809 |  |  |
Accumulated exploration credits | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 100,304 |  |  |
Approved exploration expenditures | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,094 |  |  |  |  |  |  |
Total carried credits | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 246,507 |  |  |  |  |  |  |
Ininngui License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 1,366 | 1,390 |  |  |  |  |  |  |  |  |
License fee paid |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated exploration credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,044 |  |  |  |  |  |
Total carried credits |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,929 |  |  |  |  |  |  |  |
Period of license |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years | 5 years |  |  |  |  |
Exploration cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,698 |  |  |  |  |  |  |  |
Ininngui License [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 535 |  |  |  |  |  |
Ininngui License [Member] | Danish Krone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License fee paid | kr |  |  |  |  | kr 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated exploration credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,677 |  |  |  |  |  |
Total carried credits |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,044 |  |  |  |  |  |  |  |
Ininngui License [Member] | Danish Krone [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,715 |  |  |  |  |  |
Ininngui License [Member] | Danish Krone [Member] | Not Later Than Two Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 2,276 |  |  |  |  |
Ininngui License [Member] | Danish Krone [Member] | Not Later Than Three Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,790 |  |  |  |  |
Ininngui License [Member] | Danish Krone [Member] | Not Later Than Four Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration requirement | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 9,367 |  |  |  |  |
Ikertoq License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 132 |  |  |  |  |  |  |  |  |  |
License fee paid |  |  |  |  |  |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of license |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Ikertoq License [Member] | Danish Krone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License fee paid | kr |  |  |  |  |  |  |  |  | kr 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Carbonatite License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | 1,282 |  |  |  |  |  |  |  |  |  |
License fee paid |  |  |  |  |  |  |  |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |
Period of license |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |
Carbonatite License [Member] | Danish Krone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License fee paid | kr |  |  |  |  |  |  |  |  |  |  | kr 31 |  |  |  |  |  |  |  |  |  |  |
Section 35 Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and license related expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 2 | $ 3 |  |  |  |  |  |  |  |  |
Length of metallic minerals lease |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area covered by metallic minerals lease | a |  | 320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 320 |
Reclamation deposit |  | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Section 35 Property [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of production royalty payable |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Section 35 Property [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of production royalty payable |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |
Section 35 Property [Member] | Not Later Than Five Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rental fee | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.00 |
Section 35 Property [Member] | Later Than Five Years and Not Later Than Ten Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rental fee | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00 |
Section 35 Property [Member] | Year 11 Onwards [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rental fee | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00 |
Section 35 Property [Member] | Year 11 Onwards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rental fee | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00 |
Section 35 Property [Member] | LaterThan Ten Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional annual rental fee | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.00 |
Section 35 Property [Member] | US Dollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclamation deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |

X
- Definition The amount of accumulated exploration credits. + References No definition available. + Details
Name: | NAN_AccumulatedExplorationCredits
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Additional annual rental fee. + References No definition available. + Details
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Namespace Prefix: | NAN_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of advances payable annually on net smelter return royalties. + References No definition available. + Details
Name: | NAN_AdvancesPayableAnnuallyOnNetSmelterReturnRoyalties
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of license carried credits. + References No definition available. + Details
Name: | NAN_AmountOfLicenseCarriedCredits
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Annual rental fee. + References No definition available. + Details
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Namespace Prefix: | NAN_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of approved exploration expenditures. + References No definition available. + Details
Name: | NAN_ApprovedExplorationExpenditures
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area covered by metallic minerals lease. + References No definition available. + Details
Name: | NAN_AreaCoveredByMetallicMineralsLease
Namespace Prefix: | NAN_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount incurred for exploration and license related expenditures. + References No definition available. + Details
Name: | NAN_ExplorationAndLicenseRelatedExpenditure
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount spent on exploration costs. + References No definition available. + Details
Name: | NAN_ExplorationCost
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of minimum exploration expenditures required by terms of license. + References No definition available. + Details
Name: | NAN_ExplorationRequirement
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Ifrs Statement Line Items. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Length of metallic minerals lease. + References No definition available. + Details
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Namespace Prefix: | NAN_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of license fee paid. + References No definition available. + Details
Name: | NAN_LicenseFeePaid
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of days from decision to commence commercial production when reduction of net smelter return royalties is possible. + References No definition available. + Details
Name: | NAN_NumberOfDaysFromDecisionToCommenceCommercialProductionToReduceNetSmelterReturnRoyalties
Namespace Prefix: | NAN_
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Balance Type: | na
Period Type: | duration

X
- Definition The amount of payment required to reduce net smelter return royalties. + References No definition available. + Details
Name: | NAN_PaymentRequiredToReduceNetSmelterReturnRoyalties
Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of interest in property to be acquired on basis of option agreement. + References No definition available. + Details
Name: | NAN_PercentageOfInterestInPropertyToBeAcquiredOnBasisOfOptionAgreement
Namespace Prefix: | NAN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of net smelter return royalties. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Percentage of net smelter return royalties after reduction. + References No definition available. + Details
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