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Note 7 - Inventories
6 Months Ended
Sep. 30, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
7. Inventories
 
Inventories consisted of the following (in thousands):
 
 
 
September 30,
 
 
March 31,
 
 
 
2016
 
 
2016
 
 
 
(unaudited)
 
Raw materials
  $ 19,348     $ 18,269  
Work in process
    43,234       41,549  
Finished goods
    27,114       29,786  
Total
  $ 89,696     $ 89,604