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Commitments and contingencies (Tables)
12 Months Ended
Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]  
Operating Lease Expenses Included in Determination of Net Income

Operating lease expense that has been included in the determination of the net income is as follows:

 

     Years ended March 31,  
     2011      2012      2013  
     US$      US$      US$  

Office premises

     707,772         778,364         726,893   

Residential apartments for employees

     128,956         102,725         104,557   
  

 

 

    

 

 

    

 

 

 

Total operating lease expense

     836,728         881,089         831,450   
  

 

 

    

 

 

    

 

 

 
Minimum Annual Lease Commitments

The minimum annual lease commitments under the above operating leases that have initial or remaining terms in excess of one year are as follows:

 

For the year ending March 31,

   US$  

2014

     350,284   

2015

     217,794   

2016

     224,328   

2017

     231,058   

2018

     278,742