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Plant and Equipment
 12 Months Ended
Mar. 31, 2025
Plant and Equipment [Abstract]  
Plant and Equipment
7. Plant and Equipment
 
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 
 
Plant and equipment located in the foreign countries where the Company has facilities, net of accumulated depreciation, totaled $27,760,000 and $33,455,000, of which $25,001,000 and $30,992,000 is located in Mexico, at March 31, 2025 and 2024, respectively.