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Commitments and contingent liabilities (Tables)
12 Months Ended
Mar. 31, 2021
Commitments and contingent liabilities  
Capital expenditures

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

    March 31,
    2020   2021
    $ in thousands   $ in thousands
         
Construction in Xinxing, Guangdong, PRC     40       1,015  
                 
      40       1,015