CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Revenues:
Sales of products	$ 7,310	$ 3,013
Services	456	277
Total Revenues	7,766	3,290
Cost of sales:
Cost of product sales	5,926	1,717
Cost of services	131	75
Total cost of sales	6,057	1,792
Gross profit	1,709	1,498
Selling, general and administrative expenses	588	579
Income from operations	1,121	919
Other income:
Interest and dividend income	1	0
Income before provision for income taxes	1,122	919
Provision for income taxes	452	3
Net income	$ 670	$ 916
Net income per share:
Basic (in dollars per share)	$ 0.05	$ 0.07
Weighted average shares used in computation of net income per share:
Basic (in shares)	12,963	12,963