Material accounting policies, Revenue and Income Recognition (Details)	12 Months Ended
Dec. 31, 2025
Material accounting policies [Abstract]
Percentage of demurrage claim submitted is recognized as demurrage revenue	95.00%

Percentage of demurrage claim submitted is recognized as demurrage revenue upon initial recognition.

No definition available.

Name:	hafn_PercentageOfDemurrageClaimSubmittedIsRecognizedAsDemurrageRevenue
Namespace Prefix:	hafn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration