Note 4 - Inventory
9 Months Ended
Jan. 31, 2014
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 are summarized by major classification as follows (in thousands):

   
January 31, 2014
   
April 30, 2013
 
Raw material
  $ 3,838     $ 3,077  
Work-in-process
    1,612       1,409  
Finished goods
    2,992       2,434  
      8,442       6,920  
Reserves
    (602 )     (682 )
    $ 7,840     $ 6,238