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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2020
Plant and Equipment [Abstract]  
Plant and Equipment, at Cost
Plant and equipment if comprised of the following:

  
March 31, 2020
  
March 31, 2019
 
Machinery and equipment
 
$
48,424,000
  
$
39,953,000
 
Office equipment and fixtures
  
25,541,000
   
20,070,000
 
Leasehold improvements
  
10,519,000
   
9,451,000
 
   
84,484,000
   
69,474,000
 
Less accumulated depreciation
  
(39,527,000
)
  
(34,323,000
)
Total
 
$
44,957,000
  
$
35,151,000