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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2024
Plant and Equipment [Abstract]  
Plant and Equipment, at Cost
Plant and equipment is comprised of the following:

 
 
March 31, 2024
   
March 31, 2023
 
Machinery and equipment
 
$
63,048,000
   
$
62,556,000
 
Office equipment and fixtures
   
33,463,000
     
32,769,000
 
Leasehold improvements
   
15,110,000
     
14,301,000
 
     
111,621,000
     
109,626,000
 
Less: accumulated depreciation
   
(73,283,000
)
   
(63,574,000
)
                 
Total
 
$
38,338,000
   
$
46,052,000