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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2017
Summary of Significant Accounting Policies [Abstract]  
Reconciliation of basic and diluted net income per share
The following presents a reconciliation of basic and diluted net income per share.


  
Years Ended March 31,
 
  
2017
  
2016
  
2015
 
Net income
 
$
37,573,000
  
$
10,563,000
  
$
11,453,000
 
Basic shares
  
18,608,812
   
18,233,163
   
16,734,539
 
Effect of dilutive stock options and warrants
  
809,894
   
832,930
   
871,401
 
Diluted shares
  
19,418,706
   
19,066,093
   
17,605,940
 
Net income per share:
            
Basic net income per share
 
$
2.02
  
$
0.58
  
$
0.68
 
             
Diluted net income per share
 
$
1.93
  
$
0.55
  
$
0.65
 
Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted
The following summarizes the Black-Scholes option-pricing model assumptions used to derive the weighted average fair value of the stock options granted during the periods noted.

  
Years Ended March 31,
 
  
2017
  
2016
  
2015
 
Weighted average risk free interest rate
  
1.39
%
  
1.73
%
  
1.75
%
Weighted average expected holding period (years)
  
5.84
   
5.76
   
5.01
 
Weighted average expected volatility
  
47.42
%
  
46.84
%
  
46.02
%
Weighted average expected dividend yield
  
-
   
-
   
-
 
Weighted average fair value of options granted
 
$
13.09
  
$
14.14
  
$
9.65