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Marketable Securities (Tables)
9 Months Ended
Mar. 31, 2017
Marketable Securities [Abstract]  
Summary of the fair value, the amortized cost and unrealized holding gains (losses) on marketable securities
The following table summarizes the fair value, the amortized cost and unrealized holding gains (losses) on our marketable securities as of March 31, 2017 and June 30, 2016:
 
 
Fair Value
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
(Dollars in Thousands)
March 31, 2017:
 

 
 

 
 

 
 

U.S. corporate bonds
$
17,137

 
$
17,139

 
$

 
$
(2
)
Total short-term marketable securities
$
17,137

 
$
17,139

 
$

 
$
(2
)
 
 
 
 
 
 
 
 
June 30, 2016:
 

 
 

 
 

 
 

U.S. corporate bonds
$
3,006

 
$
3,006

 
$

 
$

Total short-term marketable securities
$
3,006

 
$
3,006

 
$

 
$