CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Revenues:
Sales of products	$ 1,709	$ 4,034	$ 6,769	$ 6,048
Services	297	449	924	988
Total Revenues	2,006	4,483	7,693	7,036
Cost of sales:
Cost of product sales	1,372	2,960	4,222	4,931
Cost of services	146	195	349	350
Total cost of sales	1,518	3,155	4,571	5,281
Gross profit	488	1,328	3,122	1,755
Research and development expenses	0	7	0	31
Selling, general and administrative expenses	580	596	1,803	1,895
(Loss) income from operations	(92)	725	1,319	(171)
Other income (expense):
Interest and dividend income	0	0	0	2
Other	0	0	0	(1)
(Loss) income before provision for income taxes	(92)	725	1,319	(170)
(Benefit of) provision for income taxes	(3)	0	20	0
Net (loss) income	$ (89)	$ 725	$ 1,299	$ (170)
Net (loss) income per share:
Basic (in dollars per share)	$ (0.01)	$ 0.06	$ 0.10	$ (0.01)
Weighted average shares used in computation of net (loss) income per share:
Basic (in shares)	12,963	12,963	12,963	12,963