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Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2014
Plant and Equipment [Abstract]  
Plant and equipment, at cost
Plant and equipment, at cost, are as follows at March 31:

 
2014
  
2013
 
Machinery and equipment
 
$
25,092,000
  
$
24,342,000
 
Office equipment and fixtures
  
7,552,000
   
6,761,000
 
Leasehold improvements
  
7,569,000
   
7,613,000
 
 
  
40,213,000
   
38,716,000
 
Less accumulated depreciation
  
(29,188,000
)
  
(28,680,000
)
 
        
Total
 
$
11,025,000
  
$
10,036,000