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Note 4 - Inventories, net (Tables)
 6 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of:

 
  
September 30,
2016
    
March 31,
2016
  
 
            
Purchased parts
  
$
2,855,331
    
$
3,420,249
  
Work-in-process
    
1,107,107
      
1,446,293
  
Finished goods
    
18,350
      
102,490
  
Less: Inventory reserve
    
(305,000
)
    
(290,000
)
 
  
$
3,675,788
    
$
4,679,032