2. STOCK-BASED COMPENSATION (Details Narrative) (USD $)	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Stock-Based Compensation Details Narrative
Stock-based compensation expense related to stock options	$ 151,000	$ 155,000
Unrecognized stock-based compensation cost related to unvested stock-based awards, net of estimated forfeitures	1,045,000
Estimated forfeitures of unvested stock based awards	3,000
Weighted average remaining service period of the underlying options	3 years 2 months 13 days
Stock-based compensation related to the ESPP	18,000	10,000
Compensation cost related to options to purchase the Company's common stock under the ESPP but not yet recognized	36,000
Weighted average remaining service period for ESPP	9 months 18 days
Intrinsic value of options exercised	$ 42,000	$ 0
Weighted average remaining contractual life of the options exercisable and expected to be exercisable	4 years 1 month 6 days
Options exercisable	1,541,000	1,547,000
Average exercise prices of the options exercisable	$ 2.70	$ 3.59