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Note 3 - Inventories (Tables)
6 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
September 30, 2015
 
 
March 31,
2015
 
Raw materials
  $ 11,641     $ 10,366  
Work-in-process
    124       530  
Finished goods
    2,022       1,913  
Less: reserve
    (424 )     (389 )
    $ 13,363     $ 12,420