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Marketable Securities (Tables)
 12 Months Ended
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable securities, classified as “available-for-sale”
Marketable securities, all of which were classified as “available-for-sale” at March 31, 2013 and 2012, consisted of the following (dollars in thousands):
 
March 31,
 
2013
 
2012
Available-for-sale marketable securities
 
 
 
Amortized cost
$
16,596

 
$
22,101

Gross unrecognized holding gains
—

 
126

Gross unrecognized holding losses
(8
)
 
—

Fair value
$
16,588

 
$
22,227