Inventories (Tables)

12 Months Ended

Apr. 30, 2014

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following at April 30:

$ in thousands	2014		2013
Finished goods	$	2,909	$	4,052
Work-in-process		1,550		1,678
Materials and components		7,479		7,473
Total inventories	$	11,938	$	13,203