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10. CAPITAL STOCK (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
May 31, 2010
May 31, 2013
$0.59-$0.97
May 31, 2013
$1.09-$1.95
May 31, 2013
$2.15-$2.52
May 31, 2013
$8.45-$9.94
May 31, 2013
$0.59-$9.94
Number of Options Outstanding, Ending 2,956 2,957 2,083 1,949 1,165 1,331 252 208 2,956
Weighted Average Remaining Contractual Life (Years) Options Outstanding         4 years 2 months 12 days 4 years 4 months 13 days 9 months 18 days 1 month 6 days 3 years 8 months 12 days
Weighted Average Exercise Price Outstanding, Ending $ 1.79 $ 2.40 $ 3.40 $ 3.88 $ 0.76 $ 1.44 $ 2.24 $ 9.26 $ 1.79
Options exercisable and expected to be exercisable 2,897       873 630 237 208 1,948
Weighted Average Remaining Contractual Life (Years) Options Exercisable         3 years 8 months 16 days 3 years 7 months 6 days 8 months 19 days 1 month 6 days 2 years 11 months 1 day
Weighted Average Exercise Price Exercisable         $ 0.81 $ 1.54 $ 2.25 $ 9.26 $ 2.12
Aggregate Intrinsic Value                 $ 614