Inventories (Tables)

6 Months Ended

Oct. 31, 2013

Inventories [Abstract]

Schedule of Inventory, Current [Table Text Block]

	October 31, 2013		April 30, 2013
Raw materials	$	1,101,000	$	850,000
Work in process	329,000		281,000
Finished goods	362,000		260,000
	$	1,792,000	$	1,391,000