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Property, Plant and Equipment, Net (Tables)
9 Months Ended
Jan. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment, net consist of the following (in thousands):
   
January 31,
  
April 30,
 
   
2013
  
2012
 
Land, buildings and improvements
 $29,298  $29,624 
Furniture and equipment
  24,509   22,836 
    53,807   52,460 
Less accumulated depreciation
  (27,986)  (26,536)
   $25,821  $25,924