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