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FLOW THROUGH SHARE PREMIUM - Additional information (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
FLOW-THROUGH SHARE PREMIUM
Tax deduction	100.00%
Expenditure incurred in qualifying CEE	$ 81,699,542	$ 66,727,234
Amortization of flow-through liabilities	22,932,528	17,165,846
Flow-through share premium	12,426,322	$ 20,063,350	$ 22,729,196
Part XII.6 tax	584,120
Less than one year
FLOW-THROUGH SHARE PREMIUM
Spend for satisfy remaining flow-through obligations	45,500,423
Flow-through share premium	12,426,322
Part XII.6 tax	$ 584,120

X

- Definition

The amount of expenditure incurred in Qualifying Canadian Exploration Expense (CEE).

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The amount of flow-through share premium.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of amortization of flow-through share liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	nfgc_
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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

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X

- Definition

Amount of tax and penalties under Part XII.6 (look-back rule).

+ References

No definition available.

+ Details

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Namespace Prefix:	nfgc_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The represent of Share arrangements of tax deductions.

+ References

No definition available.

+ Details

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Namespace Prefix:	nfgc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- Definition

Amount of spend for satisfy remaining flow through obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	nfgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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