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Share-based Payments (Tables)
 6 Months Ended
Sep. 30, 2018
Share-based Payments [Abstract]  
Black-Scholes Option Pricing Model Assumptions used to Derive Weighted Average Fair Value of Stock Options Granted
The following assumptions were used to derive the weighted average fair value of the stock options granted:

  
Six Months Ended
September 30,
 
  
2018
  
2017
 
Weighted average risk free interest rate
  
2.82
%
  
1.90
%
Weighted average expected holding period (years)
  
5.94
   
5.82
 
Weighted average expected volatility
  
43.98
%
  
47.36
%
Weighted average expected dividend yield
  
-
   
-
 
Weighted average fair value of options granted
 
$
8.71
  
$
12.69
 
Stock Option Transactions
The following is a summary of stock option transactions:

  
Number of
Shares
  
Weighted Average
Exercise Price
 
Outstanding at March 31, 2018
  
1,143,298
  
$
16.97
 
Granted
  
245,400
  
$
19.02
 
Exercised
  
(39,032
)
 
$
6.24
 
Forfeited
  
(9,700
)
 
$
26.43
 
Outstanding at September 30, 2018
  
1,339,966
  
$
17.59
 
Restricted Stock Units Activity
The following is a summary of non-vested RSUs:

  
Number of
Shares
  
Weighted Average
Grant Date Fair
Value
 
Outstanding at March 31, 2018
  
133,828
  
$
28.37
 
Granted
  
78,400
  
$
19.00
 
Vested
  
(45,966
)
 
$
28.77
 
Forfeited
  
(1,434
)
 
$
28.37
 
Outstanding at September 30, 2018
  
164,828
  
$
23.80