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Note 6 - Inventories
6 Months Ended
Sep. 30, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
NOTE 6. INVENTORIES

     Inventories consisted of the following:
 
 
 
Sept. 30,
2016
 
 
March 31,
2016
 
Raw materials
  $ 639,275     $ 810,987  
Work in process
    1,808,909       1,653,800  
Finished goods
    460,697       740,446  
Total inventories
  $ 2,908,881     $ 3,205,233