Borrowings, Carrying Amount and Fair Values (Details)	6 Months Ended
Jun. 30, 2025
Bottom of Range [Member]
Carrying amounts and fair values [Abstract]
Borrowings floating interest rate	1 month
Top of Range [Member]
Carrying amounts and fair values [Abstract]
Borrowings floating interest rate	3 months

Period of time of floating interest rate borrowing re-priceable interval, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	hafn_BorrowingsFloatingInterestRateRePriceableInterval
Namespace Prefix:	hafn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration