MATERIAL ACCOUNTING POLICY INFORMATION - Additional Information (Details)	12 Months Ended
Dec. 31, 2025
MATERIAL ACCOUNTING POLICY INFORMATION.
Maximum discount rate from market value of securities escrowed or restricted sale or transfer	10

The maximum discount rate from market value of securities escrowed or restricted sale or transfer.

No definition available.

Name:	nfgc_MaximumDiscountRateFromMarketValueOfSecuritiesEscrowedOrRestrictedSaleOrTransfer
Namespace Prefix:	nfgc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration