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Note 4 - Inventories, net
 9 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
Note 4 – Inventories, net

Inventories consist of:

 
  
December 31,
2016
    
March 31,
2016
  
 
            
Purchased parts
  
$
2,999,640
    
$
3,420,249
  
Work-in-process
    
1,491,461
      
1,446,293
  
Finished goods
    
292,786
      
102,490
  
Less: Inventory reserve
    
(310,000
)
    
(290,000
)
 
  
$
4,473,887
    
$
4,679,032