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Accounts Receivable
 12 Months Ended
Mar. 31, 2013
Accounts Receivable [Abstract]  
Accounts Receivable

4.    Accounts Receivable

Accounts receivable at March 31, 2013 and 2012 consisted of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

March 31,

 

 

March 31,

 

 

2013

 

 

2012

Accounts receivable (billed)

$
17,222 

 

$
16,240 

Accounts receivable (unbilled)

 
1,642 

 

 
2,811 

Less: Allowance for doubtful accounts

 

 -

 

 
(52)

  Accounts receivable, net

$
18,864 

 

$
18,999 

 

As of March 31, 2013, three customers, Inox, CGPS, and HHI, accounted for approximately 41%, 17% and 11%, respectively, of our total receivable balance.  As of March 31, 2012, three customers, Inox, Karara Mining Ltd, and EPC Service Company, accounted for approximately 24%, 14%, and 11%, respectively, of our total receivable balance.