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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2022
Plant and Equipment [Abstract]  
Plant and Equipment, at Cost
Plant and equipment is comprised of the following:

 
 
March 31, 2022
   
March 31, 2021
 
 
           
Machinery and equipment
 
$
63,094,000
   
$
58,957,000
 
Office equipment and fixtures
   
31,434,000
     
28,758,000
 
Leasehold improvements
   
13,473,000
     
12,152,000
 
     
108,001,000
     
99,867,000
 
Less accumulated depreciation
   
(56,939,000
)
   
(46,013,000
)
                 
Total
 
$
51,062,000
   
$
53,854,000