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INVENTORIES (DETAILS TEXTUAL) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Inventory [Line Items] |  |  |
Slow Moving Inventories | $ 80 | $ 125 | $ 56

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- 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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- 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