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Note 4 - Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
   

March 31,

 
   

2015

   

2014

 

Land

  $ 1,614     $ 873  

Buildings

    4,721       4,685  

Manufacturing equipment

    6,797       6,054  

Computer equipment

    1,845       1,487  

Other

    1,343       393  
      16,320       13,492  

Less accumulated depreciation

    (6,722 )     (5,812 )
    $ 9,598     $ 7,680