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Note 3 - 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
  $ 9,282     $ 10,366  
Work-in-process
    549       530  
Finished goods
    5,383       1,913  
Less: reserve
    (498 )     (389 )
    $ 14,716     $ 12,420