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Inventories
9 Months Ended
Jan. 31, 2012
Note 3 — Inventories [Abstract]  
Inventory Disclosure [Text Block]
Inventories
 
The components of inventories are summarized as follows:
 
 
January 31,
2012
April 30,
2011
Raw materials
$
764,000

$
983,000

Work in process
348,000

300,000

Finished goods
150,000

118,000

 
$
1,262,000

$
1,401,000