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Commitments and contingent liabilities (Tables)
12 Months Ended
Mar. 31, 2017
Commitments and contingent liabilities  
Capital expenditures
    March 31,  
    2016     2017  
    $ in thousands     $ in thousands  
             
Construction in Xinxing, Guangdong, PRC     48       31  
Mold     -       22  
                 
      48       53