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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2019
Plant and Equipment [Abstract]  
Plant and Equipment, at Cost
The following summarizes plant and equipment, at cost, at March 31:

  
2019
  
2018
 
Machinery and equipment
 
$
39,953,000
  
$
42,976,000
 
Office equipment and fixtures
  
20,070,000
   
11,380,000
 
Leasehold improvements
  
9,451,000
   
7,832,000
 
   
69,474,000
   
62,188,000
 
Less accumulated depreciation
  
(34,323,000
)
  
(33,866,000
)
Total
 
$
35,151,000
  
$
28,322,000