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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

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- Definition slow moving inventories during the period. + References No definition available. + Details
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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