v2.4.0.8
10. CAPITAL STOCK (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Available Shares Stock Option Tranactions      
Available Shares, Beginning 1,737 839 687
Additional shares reserved   1,223 1,199
Options granted (908) (670) (1,141)
Options terminated 420 569 258
Plan shares expired (104) (224) (164)
Available Shares, Ending 1,145 1,737 839
Outstanding Options Stock Option Tranactions      
Options Outstanding, Beginning 2,956 2,957 2,083
Options Granted 908 670 1,141
Options terminated (420) (569) (258)
Plan options exercised (442) (102) (9)
Number of Options Outstanding, Ending 3,002 2,956 2,957
Options exercisable and expected to be exercisable 2,942    
Weighted Average Exercise Price Outstanding, Beginning $ 1.79 $ 2.40 $ 3.40
Weighted Average Exercise Price Granted $ 1.64 $ 1.13 $ 0.92
Weighted Average Exercise Price Terminated $ 5.51 $ 4.37 $ 3.72
Weighted Average Exercise Price Exercised $ 1.17 $ 0.67 $ 0.85
Weighted Average Exercise Price Outstanding, Ending $ 1.31 $ 1.79 $ 2.40
Weighted Average Exercise Price Exercisable and expected to be exercisable $ 1.31    
Aggregate Intrinsic Value, beginning balance $ 964 $ 587 $ 298
Aggregate Intrinsic Value, ending balance 2,913 964 587
Aggregate Intrinsic Value for Options exercisable and expected to be exercisable $ 2,855