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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2025
Plant and Equipment [Abstract]  
Plant and Equipment, at Cost
Plant and equipment is comprised of the following:
 
         
      March 31, 2025       March 31, 2024  
Plant and equipment
           
Machinery and equipment
  $62,330,000    $63,048,000 
Office equipment and fixtures
   34,250,000     33,463,000 
Leasehold improvements
   13,485,000     15,110,000 
     110,065,000     111,621,000 
Less: accumulated depreciation
   (78,075,000    (73,283,000
Total plant and equipment
  $31,990,000    $38,338,000