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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2016
Plant and Equipment [Abstract]  
Plant and equipment, at cost
The following summarizes plant and equipment, at cost, at March 31:

  
2016
  
2015
 
Machinery and equipment
 
$
29,340,000
  
$
25,963,000
 
Office equipment and fixtures
  
10,527,000
   
8,602,000
 
Leasehold improvements
  
7,391,000
   
7,422,000
 
   
47,258,000
   
41,987,000
 
Less accumulated depreciation
  
(31,159,000
)
  
(29,452,000
)
         
Total
 
$
16,099,000
  
$
12,535,000