10. CAPITAL STOCK (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified					12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011	May 31, 2014 $0.59-$0.97	May 31, 2014 $1.09-$1.42	May 31, 2014 $1.73-$1.95	May 31, 2014 $2.15-$2.68	May 31, 2014 $0.59-$2.68
Number of Options Outstanding, Ending	3,002	2,956	2,957	2,083	871	1,432	460	239	3,002
Weighted Average Remaining Contractual Life (Years) Options Outstanding					4 years 4 days	4 years 10 months 13 days	2 years 9 months 18 days	5 years 3 months 25 days	4 years 3 months 25 days
Weighted Average Exercise Price Outstanding, Ending	$ 1.31	$ 1.79	$ 2.40	$ 3.40	$ 0.73	$ 1.28	$ 1.88	$ 2.54	$ 1.31
Options exercisable and expected to be exercisable					702	661	384	145	1,892
Weighted Average Exercise Price Exercisable					$ 0.77	$ 1.28	$ 1.91	$ 1.33	$ 1.22
Weighted Average Remaining Contractual Life (Years) Options Exercisable					3 years 10 months 13 days	4 years 3 months 4 days	2 years 2 months 19 days	4 years 5 months 8 days	3 years 8 months 19 days
Aggregate Intrinsic Value									$ 1,835