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FLOW THROUGH SHARE PREMIUM - Additional Information (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Flow Through Share Premium [Line Items] |  |
Expenditure incurred in qualifying CEE | $ 33,254,971 | $ 6,443,941
Amortization of flow-through liabilities | 6,617,730 | 1,772,188
Low-through share premium | 22,729,196 | $ 185,431
Spend for satisfy remaining flow-through obligations | 48,000,000 |
Flow-through share premium, non current portion | 12,600,000 |
Issued November 25, 2021 |  |
Flow Through Share Premium [Line Items] |  |
Low-through share premium | 12,600,000 |
Issued August 24, 2021 |  |
Flow Through Share Premium [Line Items] |  |
Low-through share premium | 10,129,196 |
Less than one year |  |
Flow Through Share Premium [Line Items] |  |
Additional expenditure incurred in qualifying CEE | 39,920,949 |
Within two years |  |
Flow Through Share Premium [Line Items] |  |
Low-through share premium | $ 10,129,196 |

X
- Definition The amount of additional expenditure incurred in Qualifying Canadian Exploration Expense (CEE). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenditure incurred in Qualifying Canadian Exploration Expense (CEE). + References No definition available. + Details
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Namespace Prefix: | nfgc_
Data Type: | xbrli:monetaryItemType
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X
- Definition The amount of flow-through share premium. + References No definition available. + Details
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X
- Definition The amount of amortization of flow-through share liabilities. + References No definition available. + Details
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X
- Definition The amount of flow-through share premium classified as non-current. + References No definition available. + Details
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- 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
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X
- Definition Amount of spend for satisfy remaining flow through obligations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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