CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Revenues:
Sales of products	$ 4,034	$ 1,146	$ 6,048	$ 4,390
Services	449	226	988	676
Total Revenues	4,483	1,372	7,036	5,066
Cost of sales:
Cost of product sales	2,960	1,023	4,931	3,401
Cost of services	195	26	350	94
Total cost of sales	3,155	1,049	5,281	3,495
Gross profit	1,328	323	1,755	1,571
Research and development expenses	7	0	31	0
Selling, general and administrative expenses	596	576	1,895	1,803
Income (loss) from operations	725	(253)	(171)	(232)
Other income (expense):
Interest and dividend income	0	2	2	5
Other	0	0	(1)	12
Income (loss) before income taxes	725	(251)	(170)	(215)
Provision for (benefit of) income taxes	0	(10)	0	(10)
Net income (loss)	$ 725	$ (241)	$ (170)	$ (205)
Net income (loss) per share:
Basic and diluted (in dollars per share)	$ 0.06	$ (0.02)	$ (0.01)	$ (0.02)
Weighted average shares used in computation of net income (loss) per share:
Basic and diluted (in shares)	12,963	12,963	12,963	12,963