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Share-based Payments (Tables)
 12 Months Ended
Mar. 31, 2018
Share-based Payments [Abstract]  
Summary of stock option activity
The following is a summary of stock option activity during the year:

  
Number of
Shares
  
Weighted Average
Exercise Price
 
Outstanding at March 31, 2016
  
1,036,359
  
$
14.92
 
Granted
  
170,890
  
$
27.27
 
Exercised
  
(55,351
)
 
$
8.65
 
Forfeited
  
(8,600
)
 
$
28.92
 
Outstanding at March 31, 2017
  
1,143,298
  
$
16.97
 
Summary of options outstanding
The following summarizes information about the options outstanding at March 31, 2018:

   
Options Outstanding
 
Options Exercisable
Range of
Exercise price
  
Shares
  
Weighted
Average
Exercise
Price
  
Weighted
Average
Remaining
Life
In Years
  
Aggregate
Intrinsic
Value
 
Shares
  
Weighted
Average
Exercise
Price
  
Aggregate
Intrinsic
Value
$4.17 to $6.25
   
49,000
  
$
4.87
   
1.35
     
49,000
  
$
4.87
   
$6.26 to $7.43
   
354,534
   
6.48
   
4.70
     
354,534
   
6.48
   
$7.44 to $19.94
   
211,132
   
9.86
   
5.23
     
211,132
   
9.86
   
$19.95 to $34.17
   
528,632
   
27.96
   
8.12
     
203,358
   
27.54
   
    
1,143,298
  
$
16.97
   
6.24
  $
8,555,000
  
818,024
  
$
12.49
 $
8,555,000
Summary of changes in the status of non-vested restricted stock units
The following is a summary of changes in the status of non-vested RSUs during the year:

  
Number of
Shares
  
Weighted Average
Grant Date Fair
Value
 
Non-vested at March 31, 2017
  
126,277
  
$
28.26
 
Granted
  
77,854
  
$
27.70
 
Vested
  
(68,869
)
 
$
27.41
 
Forfeited
  
(1,434
)
 
$
28.37
 
Non-vested at March 31, 2018
  
133,828
  
$
28.37