Note 6 - Inventories
 9 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
NOTE
6.
INVENTORIES

          Inventories consisted of the following:
 
 
 
Dec. 31,
2016
 
 
March 31,
2016
 
Raw materials
   $
763,869
     $
810,987
  
Work in process
    
1,779,504
      
1,653,800
  
Finished goods
    
619,105
      
740,446
  
Total inventories
   $
3,162,478
     $
3,205,233