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Commitments and contingent liabilities (Tables)
12 Months Ended
Mar. 31, 2015
Commitments and contingent liabilities  
Capital expenditures
   March 31,
   2014  2015
   $ in thousands  $ in thousands
       
Construction in Xinxing, Guangdong, PRC   665    301 
Leasehold improvement in Hong Kong   73    —   
    738    301