12. CAPITAL STOCK (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Total intrinsic values of options exercised	$ 540	$ 520	$ 43
Weighted average contractual life of the options exercisable and expected to be exercisable	4 years 8 months 8 days
Exercisable options to purchase	2,189,000	1,892,000	1,948,000
Weighted average exercise prices	$ 1.43	$ 1.22	$ 2.12
1996 Stock Option Plan and 2006 Equity Incentive Plan
Authorized Shares	4,531,000
Outstanding Shares	3,686,000