CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Revenues:
Sales of products	$ 2,557	$ 7,310
Services	316	456
Total revenues	2,873	7,766
Cost of sales:
Cost of product sales	1,888	5,926
Cost of services	103	131
Total cost of sales	1,991	6,057
Gross profit	882	1,709
Research and development expenses	150	0
Selling, general and administrative expenses	657	588
Income from operations	75	1,121
Other income:
Interest and dividend income	0	1
Other	1	0
Income before provision for income taxes	76	1,122
Provision for income taxes	6	452
Net income	$ 70	$ 670
Net income per share:
Basic (in dollars per share)	$ 0.01	$ 0.05
Weighted average shares used in computation of net income per share:
Basic (in shares)	12,963	12,963