10. CAPITAL STOCK (Details 2) $ / shares in Units, $ in Thousands	12 Months Ended
	May 31, 2016 USD ($) $ / shares shares
Options exercisable and expected to be exercisable | shares	2,390,000
Weighted Average Exercise Price Exercisable | $ / shares	$ 3.69
$0.59-$0.97
Number of Options Outstanding, Ending | shares	579,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	2 years 9 months 25 days
Weighted Average Exercise Price Outstanding, Ending | $ / shares	$ .68
Options exercisable and expected to be exercisable | shares	578,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	2 years 9 months 25 days
Weighted Average Exercise Price Exercisable | $ / shares	$ .68
$1.09-$1.40
Number of Options Outstanding, Ending | shares	1,143,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	3 years 1 month 13 days
Weighted Average Exercise Price Outstanding, Ending | $ / shares	$ 1.28
Options exercisable and expected to be exercisable | shares	987,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	2 years 11 months 16 days
Weighted Average Exercise Price Exercisable | $ / shares	$ 1.28
$1.73-$2.06
Number of Options Outstanding, Ending | shares	248,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	4 years 8 months 12 days
Weighted Average Exercise Price Outstanding, Ending | $ / shares	$ 1.88
Options exercisable and expected to be exercisable | shares	221,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	4 years 9 months
Weighted Average Exercise Price Exercisable | $ / shares	$ 1.90
$2.10-$2.71
Number of Options Outstanding, Ending | shares	1,231,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	5 years 5 months 12 days
Weighted Average Exercise Price Outstanding, Ending | $ / shares	$ 2.43
Options exercisable and expected to be exercisable | shares	604,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	5 years 3 months 29 days
Weighted Average Exercise Price Exercisable | $ / shares	$ 2.46
$0.59-$2.71
Number of Options Outstanding, Ending | shares	3,201,000
Weighted Average Remaining Contractual Life (Years) Options Outstanding	4 years 29 days
Weighted Average Exercise Price Outstanding, Ending | $ / shares	$ 1.66
Options exercisable and expected to be exercisable | shares	2,390,000
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 8 months 8 days
Weighted Average Exercise Price Exercisable | $ / shares	$ 1.49
Aggregate Intrinsic Value | $	$ 189,000