Note 6 - Inventories (Tables)
 3 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June 30,
2015
 
 
March 31,
2015
 
Raw materials
   $ 776,051     $ 738,169  
Work in process
     1,680,708       2,302,751  
Finished goods
     713,842       701,572  
Total inventories
   $ 3,170,601     $ 3,742,492