CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Revenues:
Sales of products	$ 321	$ 1,451
Services	288	261
Total revenues	609	1,712
Cost of sales:
Cost of product sales	657	1,156
Cost of services	92	43
Total cost of sales	749	1,199
Gross profit (loss)	(140)	513
Selling, general and administrative expenses	610	629
Loss from operations	(750)	(116)
Other income (expense):
Interest and dividend income	1	1
Other	(3)	12
Net loss	$ (752)	$ (103)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.06)	$ (0.01)
Weighted average shares used in computation of net loss per share:
Basic and diluted (in shares)	12,963	12,963