2. STOCK-BASED COMPENSATION (Details Narrative) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Stock-based compensation costs capitalized as part of inventory	$ 67,000		$ 67,000
Stock-based compensation expense related to stock options	83,000	134,000	192,000	289,000
Estimated forfeitures of unvested stock based awards	3,000		3,000
Weighted average remaining period of the underlying options			3 years 1 month
Intrinsic value of options exercised	0	0	42,000	0
Employee Stock Purchase Plan
Weighted average remaining period of the underlying options			8 months
Stock-based compensation related to the ESPP	16,000	38,000	34,000	48,000
Compensation cost related to options to purchase the Company's common stock under the ESPP but not yet recognized	28,000		28,000
1996 Stock Option Plan
Unrecognized stock-based compensation cost	$ 1,016,000		$ 1,016,000