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Commitments and contingent liabilities (Tables)
12 Months Ended
Mar. 31, 2020
Commitments and contingent liabilities  
Capital expenditures

Capital expenditures contracted at the balance sheet date but not yet provided for are as follows: 

    March 31,
    2019   2020
    $ in thousands   $ in thousands
         
Construction in Xinxing, Guangdong, PRC     41       40  
      41       40