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Net (Loss) Income Per Share (Tables)
12 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of basic and diluted net (loss) income per share
   Year ended March 31, 
   2019   2020   2021 
   $   $   $ 
Net (loss) income attributable to Highway Holdings               
Limited’s shareholders, basic and diluted   (630)   686    (461)
Shares:               
Weighted average common shares used in computing basic net (loss) income per share   3,801,874    3,909,976    4,006,400 
Net (loss) income per share, basic   (0.17)   0.18    (0.12)