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Note 3 - Inventories (Tables)
12 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
March 31,
 
 
 
201
6
 
 
201
5
 
Raw materials
  $ 9,433     $ 10,366  
Work-in-process
    337       530  
Finished goods
    4,941       1,913  
Less reserve
    (694 )     (389 )
    $ 14,017     $ 12,420