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Commitments (Tables)
12 Months Ended
Mar. 31, 2014
Commitments  
Capital expenditures
    March 31,  
    2013     2014  
    $ in thousands     $ in thousands  
             
Construction in Xinxing, Guangdong, PRC     260       665  
Leasehold improvement in Hong Kong     -       73  
             
      260       738