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Available-for-Sale Investments (Tables)
12 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Debt and Equity Securities

The following is a summary of available-for-sale debt and equity securities as of March 31, 2015 and 2014:

 

     Cost      Net unrealized
gains
     Fair values  
     2015
US$
     2014
US$
     2015
US$
     2014
US$
     2015
US$
     2014
US$
 

Current assets:

                 

Unlisted investments

     —           1,000,000         —           50,500         —           1,050,500