Note 5 - Inventories
 12 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
NOTE 5. INVENTORIES

     Inventories are shown in the following table:
 
 
 
March 31
 
 
 
2016
 
 
2015
 
Raw materials
   $ 810,987     $ 738,169  
Work in process
     1,653,800       2,302,751  
Finished goods
     740,446       701,572  
Total inventories
   $ 3,205,233     $ 3,742,492