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Note 6 - Inventories (Tables)
9 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
December 31,
2015
 
 
March 31,
2015
 
Raw materials
  $ 734,094     $ 738,169  
Work in process
    1,568,449       2,302,751  
Finished goods
    806,368       701,572  
Total inventories
  $ 3,108,911     $ 3,742,492