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4. Inventories (Tables)
 12 Months Ended
Mar. 31, 2013
Inventory Disclosure [Text Block]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of:

   
March 31,
 
   
2013
   
2012
 
Purchased parts
 
$
4,418,989
   
$
3,452,832
 
Work-in-process
   
1,636,325
     
1,725,395
 
Finished  goods
   
385,867
     
45,748
 
Less: Allowance for obsolete inventory
   
(200,000
)
   
(200,000
)
   
$
6,241,181
   
$
5,023,975