Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Condensed Consolidated Statements Of Operations
Net sales	$ 4,130	$ 2,169
Cost of sales	2,328	1,225
Gross profit	1,802	944
Operating expenses:
Selling, general and administrative	1,601	1,518
Research and development	1,082	1,142
Gain on bankruptcy claim	0	(155)
Total operating expenses	2,683	2,505
Loss from operations	(881)	(1,561)
Interest income	0	2
Gain on sale of long-term investment	990	0
Other (expense) income, net	(12)	44
Income (loss) before income tax (benefit) expense	97	(1,515)
Income tax (benefit) expense	(27)	1
Net income (loss)	$ 124	$ (1,516)
Net income (loss) per share - basic	$ 0.01	$ (0.17)
Net income (loss) per share - diluted	$ 0.01	$ (0.17)
Shares used in per share calculations:
Basic	8,932	8,667
Diluted	9,100	8,667