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Note 4 - Inventory
3 Months Ended
Jul. 31, 2013
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
4.           INVENTORY

Inventories are stated at the lower of cost or fair value, using the first-in, first-out (FIFO) method.  Inventories, net of reserves of approximately $677,000 and $682,000 for the periods ended July 31, 2013 and April 30, 2013, respectively, are summarized by major classification as follows (in thousands):

   
July 31, 2013
   
April 30, 2013
 
Raw material
  $ 2,825     $ 2,395  
Work-in-process
    1,602       1,409  
Finished goods
    2,410       2,434  
    $ 6,837     $ 6,238