Inventories (Tables)

12 Months Ended

Apr. 30, 2013

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following at April 30:

$ in thousands	2013		2012
Finished goods	$	4,052	$	3,570
Work-in-process		1,678		1,831
Materials and components		7,473		6,359
Total inventories	$	13,203	$	11,760