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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2020
Summary of Significant Accounting Policies [Abstract]  
Reconciliation of Basic and Diluted Net (Loss) Income Per Share
The following presents a reconciliation of basic and diluted net (loss) income per share.
 
  Years Ended March 31,
 
  2020
  2019
  2018
 
Net (loss) income
 
$
(7,290,000
)
 
$
(7,849,000
)
 
$
19,264,000
 
Basic shares
  
18,913,788
   
18,849,909
   
18,854,993
 
Effect of dilutive stock options and warrants
  
-
   
-
   
659,782
 
Diluted shares
  
18,913,788
   
18,849,909
   
19,514,775
 
Net (loss) income per share:
            
Basic net (loss) income per share
 
$
(0.39
)
 
$
(0.42
)
 
$
1.02
 
Diluted net (loss) income per share
 
$
(0.39
)
 
$
(0.42
)
 
$
0.99
 
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,
 
  
2020
  
2019
  
2018
 
Weighted average risk free interest rate
  
1.76
%
  
2.83
%
  
1.92
%
Weighted average expected holding period (years)
  
5.70
   
5.94
   
5.82
 
Weighted average expected volatility
  
42.50
%
  
43.91
%
  
47.28
%
Weighted average expected dividend yield
  
-
   
-
   
-
 
Weighted average fair value of options granted
 
$
8.27
  
$
8.75
  
$
12.63