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INVENTORIES (DETAILS TEXTUAL) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Inventory [Line Items]
Slow Moving Inventories	$ 25	$ 80	$ 125

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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