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4. Inventories
 12 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
4.                   Inventories

Inventories consist of:

 
  
March 31,
  
 
  
2018
    
2017
  
Purchased parts
  
$
3,571,874
    
$
3,197,378
  
Work-in-process
    
1,051,725
      
1,272,235
  
Finished  goods
    
66,335
      
68,566
  
Less: Allowance for obsolete inventory
    
(420,000
)
    
(330,000
)
 
  
$
4,269,934
    
$
4,208,179
  

Work-in-process inventory includes $956,349 and $870,448 for government contracts at March 31, 2018 and 2017, respectively.