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4. Inventories
 12 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
4.                   Inventories

Inventories consist of:

 
  
March 31,
  
 
  
2017
    
2016
  
Purchased parts
  
$
3,197,378
    
$
3,420,249
  
Work-in-process
    
1,272,235
      
1,446,293
  
Finished  goods
    
68,566
      
102,490
  
Less: Allowance for obsolete inventory
    
(330,000
)
    
(290,000
)
 
  
$
4,208,179
    
$
4,679,032
  

Work-in-process inventory includes $870,448 and $1,331,784 for government contracts at March 31, 2017 and 2016, respectively.