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Note 5 - Inventories, net (Tables)
 3 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of:

 
  
June 30,
2017
    
March 31,
2017
  
 
            
Purchased parts
  
$
3,133,106
    
$
3,197,378
  
Work-in-process
    
1,358,129
      
1,272,235
  
Finished goods
    
9,095
      
68,566
  
Less: Inventory reserve
    
(335,000
)
    
(330,000
)
 
  
$
4,165,330
    
$
4,208,179