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INVESTMENTS (Tables)
 6 Months Ended
Sep. 30, 2014
INVESTMENTS [Abstract]  
Available-for-sale and held-to-maturity investments
Our investments are classified as either available-for-sale or held-to-maturity. The following table summarizes available-for-sale and held-to-maturity investments as of September 30, 2014 and March 31, 2014 (in thousands):

  
Available-for-Sale Investments
 
September 30, 2014
 
Amortized
Cost
  
Gross
Unrealized
Gain
  
Gross
Unrealized
(Loss)
  
Fair
Value
 
Corporate bonds
 
$
10,366
  
$
7
  
$
(36
)
 
$
10,337
 
Total available-for-sale investments
 
$
10,366
  
$
7
  
$
(36
)
 
$
10,337
 

  
Held-to-Maturity Investments
 
September 30, 2014
 
Amortized
Cost
  
Gross
Unrecognized
Gain
  
Gross
Unrecognized
(Loss)
  
Fair
Value
 
Certificates of deposit
 
$
4,477
  
$
-
  
$
(6
)
 
$
4,471
 
Commercial paper
  
3,995
   
1
   
(1
)
  
3,995
 
Corporate bonds
  
19,855
   
31
   
(85
)
  
19,801
 
Municipal bonds
  
3,031
   
17
   
(3
)
  
3,045
 
Total held-to-maturity investments
 
$
31,358
  
$
49
  
$
(95
)
 
$
31,312
 

  
Available-for-Sale Investments
 
March 31, 2014
 
Amortized
Cost
  
Gross
Unrealized
Gain
  
Gross
Unrealized
(Loss)
  
Fair
Value
 
Certificates of deposit
 
$
498
  
$
1
  
$
-
  
$
499
 
Corporate bonds
  
10,392
   
32
   
(42
)
  
10,382
 
Total available-for-sale investments
 
$
10,890
  
$
33
  
$
(42
)
 
$
10,881
 

  
Held-to-Maturity Investments
 
March 31, 2014
 
Amortized
Cost
  
Gross
Unrecognized
Gain
  
Gross
Unrecognized
(Loss)
  
Fair
Value
 
Certificates of deposit
 
$
5,722
  
$
-
  
$
(8
)
 
$
5,714
 
Commercial paper
  
12,991
   
-
   
(1
)
  
12,990
 
Corporate bonds
  
14,920
   
65
   
(33
)
  
14,952
 
Municipal bonds
  
3,079
   
20
   
(29
)
  
3,070
 
Total held-to-maturity investments
 
$
36,712
  
$
85
  
$
(71
)
 
$
36,726
 
Amortized cost and fair value of investments, classified by stated maturity
The following table summarizes the amortized cost and fair value of our investments, classified by stated maturity as of September 30, 2014 and March 31, 2014 (in thousands):

  
September 30, 2014
  
September 30, 2014
 
  
Available-for-Sale Investments
  
Held-to-Maturity Investments
 
  
Amortized Cost
  
Fair Value
  
Amortized Cost
  
Fair Value
 
Due in less than one year
 
$
6,003
  
$
6,010
  
$
14,834
  
$
14,821
 
Due in 1 to 4 years
  
4,363
   
4,327
   
16,524
   
16,491
 
Total investments
 
$
10,366
  
$
10,337
  
$
31,358
  
$
31,312
 
                 
  
March 31, 2014
  
March 31, 2014
 
  
Available-for-Sale Investments
  
Held-to-Maturity Investments
 
  
Amortized Cost
  
Fair Value
  
Amortized Cost
  
Fair Value
 
Due in less than one year
 
$
6,509
  
$
6,542
  
$
22,560
  
$
22,571
 
Due in 1 to 4 years
  
4,381
   
4,339
   
14,152
   
14,155
 
Total investments
 
$
10,890
  
$
10,881
  
$
36,712
  
$
36,726