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INVENTORIES, NET (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
Slow moving inventories	$ 45	$ 41	$ 25

X

- Definition

slow moving inventories during the period.

+ References

No definition available.

+ Details

Name:	hiho_SlowMovingInventories
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration