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Note 3 - Inventories (Tables)
12 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   

March 31,

 
   

2015

   

2014

 

Raw materials

  $ 10,366     $ 5,758  

Work-in-process

    530       272  

Finished goods

    1,913       2,068  

Less reserve

    (389 )     (327 )
    $ 12,420     $ 7,771