12. CAPITAL STOCK (Details 2) - 12 months ended May. 31, 2015 - USD ($) $ / shares in Units, $ in Thousands	Total
Options exercisable and expected to be exercisable	2,189,000
Weighted Average Exercise Price Exercisable	$ 1.43
Aggregate Intrinsic Value	$ 2,198
$0.59-$0.97
Number of Options Outstanding, Ending	680,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	3 years 10 months 6 days
Weighted Average Exercise Price Outstanding, Ending	$ .7
Options exercisable and expected to be exercisable	612,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 10 months 13 days
Weighted Average Exercise Price Exercisable	$ .71
$1.09-$1.40
Number of Options Outstanding, Ending	1,293,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	3 years 11 months 19 days
Weighted Average Exercise Price Outstanding, Ending	$ 1.28
Options exercisable and expected to be exercisable	874,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 7 months 20 days
Weighted Average Exercise Price Exercisable	$ 1.28
$1.73-$2.06
Number of Options Outstanding, Ending	411,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	3 years 8 months 16 days
Weighted Average Exercise Price Outstanding, Ending	$ 1.9
Options exercisable and expected to be exercisable	345,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 4 months 13 days
Weighted Average Exercise Price Exercisable	$ 1.92
$2.15-$2.71
Number of Options Outstanding, Ending	1,302,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	6 years 1 month 6 days
Weighted Average Exercise Price Outstanding, Ending	$ 2.45
Options exercisable and expected to be exercisable	358,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	5 years 4 days
Weighted Average Exercise Price Exercisable	$ 2.54
$0.59-$2.71
Number of Options Outstanding, Ending	3,686,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	4 years 8 months 8 days
Weighted Average Exercise Price Outstanding, Ending	$ 1.66
Options exercisable and expected to be exercisable	2,189,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 10 months 20 days
Weighted Average Exercise Price Exercisable	$ 1.43